ISO 8601 - Knowledge (XXG)

5051: 5045: 7934: 42: 789:, any number of values may be dropped from any of the date and time representations, but in the order from the least to the most significant. For example, "2004-05" is a valid ISO 8601 date, which indicates May (the fifth month) 2004. This format will never represent the 5th day of an unspecified month in 2004, nor will it represent a time-span extending from 2004 into 2005. 2258:, as in "P0,5Y" or "P0.5Y". The standard does not prohibit date and time values in a duration representation from exceeding their "carry over points" except as noted below. Thus, "PT36H" could be used as well as "P1DT12H" for representing the same duration. But keep in mind that "PT36H" is not the same as "P1DT12H" when switching from or to 520:(ISO) and was first published in 1988, with updates in 1991, 2000, 2004, and 2019, and an amendment in 2022. The standard provides a well-defined, unambiguous method of representing calendar dates and times in worldwide communications, especially to avoid misinterpreting numeric dates and times when such data is transferred between 1371:

Monday, Tuesday and Wednesday. Similarly, the last ISO week of a year may have up to three days that are actually in the Gregorian calendar year that is starting; if three, they are Friday, Saturday, and Sunday. The Thursday of each ISO week is always in the Gregorian calendar year denoted by the ISO week-numbering year.

1095:, the standard also permits the expansion of the year representation but only by prior agreement between the sender and the receiver. An expanded year representation must have an agreed-upon number of extra year digits beyond the four-digit minimum, and it must be prefixed with a + or − sign instead of the more common 557:; and combinations thereof. The standard does not assign specific meaning to any element of the dates/times represented: the meaning of any element depends on the context of its use. Dates and times represented cannot use words that do not have a specified numerical meaning within the standard (thus excluding 2370:

including the start and finish times could be shown as "2007-12-14T13:30/15:30", where "/15:30" implies "/2007-12-14T15:30" (the same date as the start), or the beginning and end dates of a monthly billing period as "2008-02-15/03-14", where "/03-14" implies "/2008-03-14" (the same year as the start).

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Annex A: ... From that concept representations of all other date and time values were logically derived; thus, ISO 2014, ISO 3307 and ISO 4031 have been superseded. ... Identification of a particular date by means of ordinal dates (ISO 2711) and by means of the week numbering

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introduced the Internet Extended Date/Time Format (IXDTF) in RFC 9557. This format extends the timestamp representation to include additional information such as an associated time zone name. The inclusion of time zone names is particularly useful for applications that need to account for events like

2800:

appears in its basic form on major brand commercial packaging in the United States. Its appearance depended on the particular packaging, canning, or bottling plant more than any particular brand. The format is particularly useful for quality assurance, so that production errors can be readily traced.

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Date and time elements including their designator may be omitted if their value is zero, and lower-order elements may also be omitted for reduced precision. For example, "P23DT23H" and "P4Y" are both acceptable duration representations. However, at least one element must be present, thus "P" is not a

2824:

RFC 3339 deviates from ISO 8601 in allowing a zero time zone offset to be specified as "-00:00", which ISO 8601 forbids. RFC 3339 intends "-00:00" to carry the connotation that it is not stating a preferred time zone, whereas the conforming "+00:00" or any non-zero offset connotes that the

2423:

If the interval specifies the start (forms 1 and 2 above), then this is the start of the repeating interval. If the interval specifies the end but not the start (form 3 above), then this is the end of the repeating interval. For example, to repeat the interval of "P1Y2M10DT2H30M" five times starting

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and the specific computer characters (such as "‐", ":", "T", "W", "Z") that are assigned specific meanings within the standard; that is, such commonplace descriptors of dates (or parts of dates) as "January", "Thursday", or "New Year's Day" are not allowed in interchange representations within

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Durations define the amount of intervening time in a time interval and are represented by the format PYMDTHMS or PW as shown on the aside. In these representations, the is replaced by the value for each of the date and time elements that follow the . Leading zeros are not required, but the maximum

2249:

To resolve ambiguity, "P1M" is a one-month duration and "PT1M" is a one-minute duration (note the time designator, T, that precedes the time value). The smallest value used may also have a decimal fraction, as in "P0.5Y" to indicate half a year. This decimal fraction may be specified with either a

2369:

For <start>/<end> expressions, if any elements are missing from the end value, they are assumed to be the same as for the start value including the time zone. This feature of the standard allows for concise representations of time intervals. For example, the date of a two-hour meeting

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starts at the first day (Monday) of week 01 and ends at the Sunday before the new ISO year (hence without overlap or gap). It consists of 52 or 53 full weeks. The first ISO week of a year may have up to three days that are actually in the Gregorian calendar year that is ending; if three, they are

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corresponding to the instant at the beginning of a calendar day; and "24:00:00" to refer to midnight corresponding to the instant at the end of a calendar day. ISO 8601-1:2019 as originally published removed "24:00:00" as a representation for the end of day although it had been permitted in

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This simple form is preferable for occasions when the arbitrary nature of week and month definitions are more of an impediment than an aid, for instance, when comparing dates from different calendars. This format is used with simple hardware systems that have a need for a date system, but where

4114:

Unknown Local Offset Convention: If the time in UTC is known, but the offset to local time is unknown, this can be represented with an offset of "-00:00". This differs semantically from an offset of "Z" or "+00:00", which imply that UTC is the preferred reference point for the specified time.

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3.5 Expansion ... By mutual agreement of the partners in information interchange, it is permitted to expand the component identifying the calendar year, which is otherwise limited to four digits. This enables reference to dates and times in calendar years outside the range supported by complete

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A time interval is the intervening time between two time points. The amount of intervening time is expressed by a duration (as described in the previous section). The two time points (start and end) are expressed by either a combined date and time representation or just a date representation.

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Calendar date representations are in the form shown in the adjacent box. indicates a four-digit year, 0000 through 9999. indicates a two-digit month of the year, 01 through 12. indicates a two-digit day of that month, 01 through 31. For example, "5 April 1981" may be represented as either

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The standard describes a duration as part of time intervals, which are discussed in the next section. The duration format on its own is ambiguous regarding the total number of days in a calendar year and calendar month. The number of seconds in a calendar day is also ambiguous because of

2358:"/"). Section 3.2.6 of ISO 8601-1:2019 notes that "A solidus may be replaced by a double hyphen by mutual agreement of the communicating partners", and previous versions used notations like "2000--2002". Use of a double hyphen instead of a solidus allows inclusion in computer 1988:

It is not permitted to state a zero value time offset with a negative sign, as "−00:00", "−0000", or "−00". The section dictating sign usage states that a plus sign must be used for a positive or zero value, and a minus sign for a negative value. A

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standard based on ISO 8601 in defining a profile of the standard that restricts the supported date and time formats to reduce the chance of error and the complexity of software. The very simple specification is based on a draft of the RFC 3339 mentioned below.

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Issued in February 2019, the fourth revision of the standard ISO 8601-1:2019 represents slightly updated contents of the previous ISO 8601:2004 standard, whereas the new ISO 8601-2:2019 defines various extensions such as uncertainties or parts of the

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As a consequence, if 1 January is on a Monday, Tuesday, Wednesday or Thursday, it is in week 01. If 1 January is on a Friday, Saturday or Sunday, it is in week 52 or 53 of the previous year (there is no week 00). 28 December is always in the last week of its year.

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ISO 8601:2000 allowed truncation (by agreement), where leading components of a date or time are omitted. Notably, this allowed two-digit years to be used as well as the ambiguous formats YY-MM-DD and YYMMDD. This provision was removed in ISO 8601:2004.

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Either basic or extended formats may be used, but both date and time must use the same format. The date expression may be calendar, week, or ordinal, and must use a complete representation. The time may be represented using a specified reduced precision format.

1027:(the explicit reference date was removed in ISO 8601-1:2019). However, ISO calendar dates before the convention are still compatible with the Gregorian calendar all the way back to the official introduction of the Gregorian calendar on 15 October 1582. 4149:

In an environment where use is made of a character repertoire based on ISO/IEC 646, "hyphen" and "minus" are both mapped onto "hyphen-minus". Representations with a "plus-minus" shall only be used in such environment if the interchange repertoire includes

655:

An amendment was published in October 2022 featuring minor technical clarifications and attempts to remove ambiguities in definitions. The most significant change, however, was the reintroduction of the "24:00:00" format to refer to the instant at the

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daylight saving time transitions. Furthermore, IXDTF maintains compatibility with pre-existing syntax for attaching time zone names to timestamps, providing a standardized and flexible approach to timestamp representation on the internet. Example:

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be safe to assume local time when communicating in the same time zone, it is ambiguous when used in communicating across different time zones. Even within a single geographic time zone, some local times will be ambiguous if the region observes

576:, dates and times are arranged such that the greatest temporal term (typically a year) is placed at the left and each successively lesser term is placed to the right of the previous term. Representations must be written in a combination of 4171:

4.3.2 NOTE: By mutual agreement of the partners in information interchange, the character may be omitted in applications where there is no risk of confusing a date and time of day representation with others defined in this International

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is used as the letter itself and is replaced by the number of repetitions. Leaving out the value for or specifying a value of -1, means an unbounded number of repetitions. A value of 0 for means the interval is not repeated.

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Alternatively, a format for duration based on combined date and time representations may be used by agreement between the communicating parties either in the basic format PYYYYMMDDThhmmss or in the extended format

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There is no limit on the number of decimal places for the decimal fraction. However, the number of decimal places needs to be agreed to by the communicating parties. For example, in Microsoft SQL Server, the

4212:

5.6. NOTE: ISO 8601 defines date and time separated by "T". Applications using this syntax may choose, for the sake of readability, to specify a full-date and full-time separated by (say) a space character.

1643:. ISO 8601-1:2019 allows the T to be omitted in the extended format, as in "13:47:30", but only allows the T to be omitted in the basic format when there is no risk of confusion with date expressions. 1646:

Either the seconds, or the minutes and seconds, may be omitted from the basic or extended time formats for greater brevity but decreased precision; the resulting reduced precision time formats are:

1084:) are not automatically allowed by the standard. Instead, the standard states that "values in the range through shall only be used by mutual agreement of the partners in information interchange". 2096:, but this provision was removed in ISO 8601-1:2019. Separating date and time parts with other characters such as space is not allowed in ISO 8601, but allowed in its profile RFC 3339. 4803: 1417:

format for the multiples of a day elapsed since the start of year. It is represented as "YYYY-DDD" (or YYYYDDD), where indicates a year and is the "day of year", from 001 through 365 (366 in

4949: 2063:

ISO 8601-2:2019 allows for general durations for time offsets. For example, more precision can be added to the time offset with the format '<time>±::.' or '<time>±HMS' as below.

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according to ISO 8601:2004.) For example, to denote "14 hours, 30 and one half minutes", do not include a seconds figure; represent it as "14:30,5", "T1430,5", "14:30.5", or "T1430.5".

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4.2.2.4 ... the decimal fraction shall be divided from the integer part by the decimal sign specified in ISO 31-0, i.e. the comma or full stop . Of these, the comma is the preferred sign.

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system (ISO 2015) were alternative methods that the basic concept of this International Standard could also encompass; thus, ISO 2015 and ISO 2711 have now been superseded.

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Contrary to this rule, RFC 3339, which is otherwise a profile of ISO 8601, permits the use of "−00" with the same denotation as "+00" but a differing connotation: an unknown

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including full calendar calculation software may be a significant nuisance. This system is sometimes referred to as "Julian Date", but this can cause confusion with the astronomical

3347: 1856:

A time zone where the civil time coincides with UTC is always designated as positive, though the offset is zero (see related specifications below). So the zone designation for

6772: 4097: 4279: 1845:) would be "−05:00","−0500", or "−05". Conversely, a positive UTC offset describes a time zone east of the prime meridian where the civil time is ahead of 3419:

E DIN ISO 8601-1:2017-02 Datenelemente und Austauschformate - Informationsaustausch - Darstellung von Datum und Uhrzeit - Teil 1: Grundlegende Regeln (ISO/DIS 8601-1:2016)

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The duration format (or a subset thereof) is widely used independent of time intervals, as with the Java 8 Duration class which supports a subset of the duration format.

744:

of the representation thus corresponds to chronological order, except for date representations involving negative years or time offset. This allows dates to be naturally

2286:. For example "P1M" on its own could be 28, 29, 30, or 31 days. There is no ambiguity when used in a time interval. Using example "P2M" duration of two calendar months: 6767: 3938: 3603: 3424: 3598:

E DIN ISO 8601-2:2017-02 Datenelemente und Austauschformate - Informationsaustausch - Darstellung von Datum und Uhrzeit - Teil 2: Erweiterungen (ISO/DIS 8601-2:2016)

3535: 4235: 6272: 5650: 4166: 4137: 3907: 3763: 3745: 3329: 3307: 3274: 517: 1779:

is the zone designator for the zero UTC offset. "09:30 UTC" is therefore represented as "09:30Z" or "T0930Z". "14:45:15 UTC" would be "14:45:15Z" or "T144515Z".

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which was formerly used as the international civil time standard. GMT is no longer precisely defined by the scientific community and can refer to either UTC or

4713: 4308: 4141: 4865: 2415:

Repeating intervals are specified in clause "4.5 Recurring time interval". They are formed by adding "R/" to the beginning of an interval expression, where

1786:

suffix in the ISO 8601 time representation is sometimes referred to as "Zulu time" or "Zulu meridian" because the same letter is used to designate the

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headers. RFC 2822 made no claim that any part of its timestamp format conforms to ISO 8601, and so was free to use this convention without conflict.

740:

Date and time values are ordered from the largest to smallest unit of time: year, month (or week), day, hour, minute, second, and fraction of second. The

644:. The ISO week numbering system was introduced in ISO 2015, and the identification of days by ordinal dates was originally defined in ISO 2711. 3207: 778:

is used as the separator between time values (hours, minutes, and seconds). For example, the 6th day of the 1st month of the year 2009 may be written as

7569: 7489: 7280: 7275: 7121: 3992: 7287: 5403: 2772:

ISO 8601 is referenced by several specifications, but the full range of options of ISO 8601 is not always used. For example, the various

1034:, may be used by mutual agreement of the partners exchanging information. The standard states that every date must be consecutive, so usage of the 5641: 4858: 3226: 2825:

offset being used is preferred. This convention regarding "-00:00" is derived from earlier RFCs, such as RFC 2822 which uses it for timestamps in

2373:

If greater precision is desirable to represent the time interval, then more time elements can be added to the representation. An interval denoted

521: 2972:

DIN ISO 8601:2006-09 (replaced DIN EN 28601:1993-02); related: DIN 5008:2011-04 (replaced DIN 5008:2005-05, DIN 5008:2001-11, DIN 5008:1996-05)

2718:

and approximate qualifiers, '?' and '~', as well as their combined used, '%'; they can be applied to the whole date or to individual components.

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For example, "P3Y6M4DT12H30M5S" represents a duration of "three years, six months, four days, twelve hours, thirty minutes, and five seconds".

394: 7963: 6182: 4036: 3996: 558: 2900: 7889: 7690: 7213: 6596: 6187: 6157: 5372: 3134:

SS-ISO 8601-1:2022, contains the official English version of ISO 8601-1:2019. (Approved 2022-05-13, replaces SS-ISO 8601:2011, edition 2)

4783: 4778: 3565: 3386: 1790:. However the ACP 121 standard that defines the list of military time zones makes no mention of UTC and derives the "Zulu time" from the 1691:

according to ISO 8601:1-2019, it does not stipulate a preference except within International Standards, but with a preference for a

7534: 6864: 6661: 4468: 4028: 3506: 3343: 5985: 4656: 7978: 7061: 6085: 5123: 3718: 3485: 4077: 4071: 4271: 7625: 6797: 6641: 630: 4563: 4525: 4478: 4430: 4109: 3848: 3805: 2833: 159: 4609: 3861: 3817: 688:

Data elements and interchange formats — Information interchange — Representation of dates and times — Technical Corrigendum 1

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includes the start and end times. To explicitly include all of the start and end dates, the interval would be represented as

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valid representation for a duration of 0 seconds. "PT0S" or "P0D", however, are both valid and represent the same duration.

4225:"Data elements and interchange formats — Information interchange - Representation of dates and times — Part 1: Basic rules" 3964: 7514: 6844: 6777: 6357: 6005: 5377: 4224: 4128: 3548: 324: 4130:

Data elements and interchange formats — Information interchange - Representation of dates and times — Part 1: Basic rules

3708: 1031: 536: 146: 3697:, in the relevant section, e.g: 2.3.7 representation with reduced accuracy. This was corrected in ISO 8601-1:2019. 728:

Date and time — Representations for information interchange — Part 1: Basic rules — Amendment 1: Technical corrections

7973: 7859: 7337: 5634: 5332: 5312: 5258: 5143: 4979: 4678: 3221: 1787: 1750:

If no UTC relation information is given with a time representation, the time is assumed to be in local time. While it

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ISO 8601:2004(E): Data elements and interchange formats — Information interchange — Representation of dates and times

3456: 4705: 4300: 7519: 7427: 7377: 7136: 6469: 6464: 4999: 4984: 4922: 4901: 1768: 766:

with separators added to enhance human readability. The standard notes that "The basic format should be avoided in

387: 7785: 7730: 7509: 7494: 7474: 6752: 6172: 5668: 5153: 4964: 3659: 2761: 186: 4424: 4398: 4381: 7833: 7740: 7529: 7504: 6716: 6711: 2773: 2293:

interval 2003-07-15T00:00:00Z/P2M ends two calendar months later at 2003-09-15T00:00:00Z which is 62 days later

2290:

interval 2003-02-15T00:00:00Z/P2M ends two calendar months later at 2003-04-15T00:00:00Z which is 59 days later

593:

in 1988. It unified and replaced a number of older ISO standards on various aspects of date and time notation:

154: 636:

ISO 2014, though superseded, is the standard that originally introduced the all-numeric date notation in

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The standard also allows for calendar dates to be written with reduced precision. For example, one may write

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A decimal fraction may be added to the lowest order time element present in any of these representations. A

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The week number can be described by counting the Thursdays: week 12 contains the 12th Thursday of the year.

1013:

ISO 8601:2004 fixes a reference calendar date to the Gregorian calendar of 20 May 1875 as the date the

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ISO 8601-2:2019 defines a set of standardised extensions to the ISO 8601 date and time formats.

786: 505: 7126: 6989: 6636: 6010: 5858: 5828: 5721: 5711: 5672: 5664: 5566: 2139:

number of digits for each element should be agreed to by the communicating parties. The capital letters

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would be contrary to the standard (because at the switchover date, the dates would not be consecutive).

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b) If necessary for a particular application, the lowest order components may have a decimal fraction.

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standards for TV, digital radio, etc. use several forms to describe points in time and durations. The

1246:

and YYYYMMDD formats for complete calendar date representations, if the day is omitted then only the

7884: 7790: 7524: 7499: 7342: 7183: 6621: 6424: 6297: 6080: 5393: 5307: 5133: 4994: 4798: 4631: 4577: 4539: 4492: 4444: 2259: 1912: 1756: 4813: 4261:

ISO 8601:2004 section 4.4.3.3 Alternative format, ISO 8601-1:2019 section 5.5.2.4 Alternative format

1759:. It is usually preferable to indicate a time zone (zone designator) using the standard's notation. 704:

Data elements and interchange formats — Information interchange — Representation of dates and times

696:

Data elements and interchange formats — Information interchange — Representation of dates and times

680:

Data elements and interchange formats — Information interchange — Representation of dates and times

7725: 7464: 5603: 5398: 5253: 5118: 5070: 4939: 3573: 3543: 3394: 2355: 1973: 1936: 1791: 1700: 1692: 1680: 1250:

format is allowed. By disallowing dates of the form YYYYMM, the standard avoids confusion with the

1092: 775: 637: 3985: 2735:

The EDTF features are described in the "Date and Time Extensions" section of ISO 8601-2:2019.

2080:

A single point in time can be represented by concatenating a complete date expression, the letter

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ISO 8601-2:2019 also defines a format to constrain repeating intervals based on syntax from

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per omitted century, year, month, week, hour and minute as necessary to disambiguate the format.

2275: 2015:. If the interchange character set is limited and does not have a minus sign character, then the 1315: 1258:

to mean "April 5" but the 2004 version does not allow omitting the year when a month is present.

1081: 1007: 532: 319: 164: 4632:"ČSN ISO 8601 (979738) Datové prvky a formáty výměny - Výměna informací - Zobrazení data a času" 2922:ČSN ISO 8601 (replaced ČSN EN 28601) (Obsolete as of 2019. No standard was given in exchange.) 1234:

to mean "1981 April". One may simply write "1981" to refer to that year, "198" to refer to the

629:

on 25 February 2019. ISO 8601 was prepared by, and is under the direct responsibility of,

6499: 5426: 5291: 5108: 4089: 4032: 3928: 3714: 3578: 3399: 2814: 1343:

in the starting year (considering that Saturdays, Sundays and 1 January are non-working days),

1065: 793: 4772: 4766: 3514: 7233: 6974: 6302: 5571: 5317: 5296: 5248: 5211: 5024: 4567: 4529: 4515: 4482: 4434: 4201: 4193: 4185: 4081: 3853: 3809: 1020: 562: 273: 2099:

If a time zone designator is required, it follows the combined date and time. For example,

7843: 7564: 7469: 7223: 7151: 7146: 7141: 6626: 6589: 6584: 6579: 6574: 6569: 6564: 6559: 5302: 5281: 5113: 5085: 4807: 4652: 4385: 3873:

Truncated representation, as specified in , Sections 5.2.1.3 d), e), and f), is permitted.

3829:

Truncated representation, as specified in , Sections 5.2.1.3 d), e), and f), is permitted.

3635: 2904: 2785: 1990: 1838: 1310:

Week date representations are in the formats as shown in the adjacent box. indicates the

1035: 577: 331: 132: 3477: 2712:

The EDTF is given as an example of a profile of ISO 8601. Some of its features are:

17: 3344:"TC 154 Processes, data elements and documents in commerce, industry and administration" 7131: 6879: 6691: 6554: 6544: 6539: 6534: 6529: 6524: 6519: 6514: 6509: 5878: 5868: 5598: 5357: 5347: 5286: 5243: 5075: 5065: 5034: 4934: 4906: 3933: 1834: 1414: 122: 453: 7952: 7919: 7894: 7879: 7815: 7810: 7805: 7800: 7795: 7640: 7585: 7554: 7544: 7407: 7397: 7367: 7362: 7312: 7292: 7270: 7255: 7208: 7173: 7116: 7111: 7101: 6979: 6924: 6899: 6894: 6874: 6747: 6287: 5863: 5726: 5696: 5485: 5436: 5421: 5367: 5138: 4974: 4969: 4885: 4354: 2943: 2797: 1904: 1861: 1842: 1811: 1688: 1594: 1352:

the first week with the majority (four or more) of its days in the starting year, and

1275: 553: 544: 509: 472: 304: 252: 225: 210: 200: 4822: 3843: 3801: 2821:. The more complex formats such as week numbers and ordinal days are not permitted. 1080:. However, years before 1583 (the first full year following the introduction of the 7780: 7750: 7610: 6954: 6949: 6812: 6807: 6802: 6721: 6666: 6616: 6549: 6504: 6479: 6409: 6404: 6399: 6394: 6389: 6347: 6312: 6222: 6217: 6045: 5853: 5619: 5583: 5470: 5465: 5460: 5447: 5186: 4832: 4601: 2016: 1738:

in ISO 8601 are represented as local time (with the location unspecified), as

1676: 1409: 1346:

the week with the starting year's first Thursday in it (the formal ISO definition),

1340: 792:

If necessary for a particular application, the standard supports the addition of a

752: 490: 127: 3769:

representations, i.e. before the start of the year or after the end of the year .

2727:

Special "month" values indicating sub-year groupings such as seasons and quarters.

712:

Date and time — Representations for information interchange — Part 1: Basic rules

4850: 4076:. Reston, VA: IETF Secretariat, Corp. for National Research Initiatives. p. 2198:

is the month designator that follows the value for the number of calendar months.

720:

Date and time — Representations for information interchange — Part 2: Extensions

7755: 7452: 7447: 7442: 7026: 6943: 5915: 5593: 5588: 5233: 5216: 5148: 5128: 5014: 4896: 4580: 4542: 4519: 4495: 4447: 3960: 3245: 2715: 2283: 2278:(e.g. a value of 13 for the month or 25 for the hour would not be permissible). 2218:

is the time designator that precedes the time components of the representation.

2049: 1628: 1320: 1254:

YYMMDD (still often used). The 2000 version also allowed writing the truncation

1096: 1069: 366: 268: 247: 215: 205: 102: 4794: 3729:

The Gregorian calendar today serves as an international standard for civil use.

2780:

audio meta-data specification also makes use of a subset of ISO 8601. The

2192:

is the year designator that follows the value for the number of calendar years.

1687:, is used as a separator between the time element and its fraction. (Following 751:

Each date and time value has a fixed number of digits that must be padded with

41: 7745: 7650: 7357: 7332: 7096: 7051: 6787: 6444: 6257: 6150: 6145: 6140: 6100: 6075: 5950: 5706: 5608: 5561: 5545: 5431: 5337: 5158: 5019: 4989: 4927: 3724: 2818: 2008: 2001: 1977: 1962: 1952: 1942: 1928: 1873: 1869: 1865: 1830: 1819: 1807: 1434: 1335:

There are several mutually equivalent and compatible descriptions of week 01:

1100: 1068:. It therefore represents years from 0000 to 9999, year 0000 being equal to 1 782:

in the extended format or as "20090106" in the basic format without ambiguity.

770:." The separator used between date values (year, month, week, and day) is the 767: 548: 465: 459: 230: 107: 2210:

is the day designator that follows the value for the number of calendar days.

2175:

are designators for each of the date and time elements and are not replaced.

7914: 7909: 7904: 7899: 7874: 7864: 7825: 7775: 7770: 7765: 7760: 7665: 7660: 7655: 7645: 7635: 7620: 7600: 7595: 7590: 7539: 7484: 7479: 7459: 7437: 7417: 7372: 7352: 7307: 7302: 7297: 7265: 7228: 7218: 7203: 7198: 7193: 7178: 7163: 7158: 7086: 7081: 7076: 7056: 7046: 7041: 7036: 7021: 7016: 6964: 6959: 6939: 6909: 6884: 6869: 6839: 6792: 6782: 6762: 6757: 6742: 6737: 6651: 6372: 6367: 6262: 5908: 5903: 5898: 5893: 5888: 5796: 5791: 5786: 5781: 5505: 5342: 5226: 5201: 5181: 5098: 5050: 5044: 5029: 4828: 4093: 2744: 2346:

Duration only, such as "P1Y2M10DT2H30M", with additional context information

2255: 1918: 1896: 1886: 1823: 1735: 1684: 1605:

is T::. Earlier versions omitted the T (representing time) in both formats.

1418: 1104: 1088: 361: 314: 309: 220: 3094:

PN-EN 28601:2002 (Obsolete as of 2008. No standard was given in exchange.)

2856:

AS/NZS ISO 8601.1:2021, AS/NZS ISO 8601.2:2021 (replaced AS ISO 8601-2007)

4761: 4557: 3448: 2236:

is the second designator that follows the value for the number of seconds.

2230:

is the minute designator that follows the value for the number of minutes.

1665:

As of ISO 8601-1:2019/Amd 1:2022, "00:00:00" may be used to refer to

7549: 7327: 7031: 6859: 6696: 6686: 6671: 6646: 6631: 6606: 6601: 6484: 6454: 6439: 6434: 6429: 6419: 6384: 6379: 6362: 6342: 6337: 6332: 6327: 6322: 6317: 6307: 6292: 6282: 6277: 6267: 6252: 6247: 6237: 6232: 6227: 6212: 6207: 6202: 6197: 6192: 6177: 6162: 6135: 6130: 6125: 6120: 6115: 6110: 6105: 6095: 6090: 6070: 6065: 6055: 6050: 6040: 6035: 6025: 6020: 6015: 5990: 5980: 5873: 5776: 5771: 5766: 5761: 5756: 5751: 5746: 5741: 5736: 5540: 5520: 5362: 5268: 5168: 4954: 4402: 3236: 2757: 2363: 2359: 1890: 1667: 1355:

the week starting with the Monday in the period 29 December to 4 January.

610: 606: 602: 598: 594: 169: 117: 75: 1703:

of a decimal fraction is 3 for a DATETIME, i.e., "yyyy-mm-ddThh:mm:ss".

1064:

ISO 8601 prescribes, as a minimum, a four-digit year to avoid the

7838: 7630: 7615: 7412: 7402: 7392: 7168: 6984: 6934: 6829: 6817: 5975: 5970: 5965: 5960: 5955: 5940: 5935: 5930: 5925: 5920: 5883: 5838: 5833: 5818: 5813: 5808: 5535: 5525: 5455: 5327: 5238: 5103: 2045: 1900: 1239: 745: 112: 63: 4845: 4206: 3884:

ISO 8601-1:2019 section 5.3.1.3 Representations with reduced precision

3649: 2224:

is the hour designator that follows the value for the number of hours.

2204:

is the week designator that follows the value for the number of weeks.

7700: 7685: 7680: 7675: 7347: 7322: 7250: 7106: 7091: 7071: 7066: 7011: 7004: 6999: 6994: 6889: 6854: 6701: 6352: 6167: 5731: 5530: 5480: 5475: 4788: 4572: 4559:

Date and Time on the Internet: Timestamps with Additional Information

4534: 4487: 4439: 4378: 4197: 4085: 3857: 3813: 3654: 3163: 1932: 1922: 1908: 1857: 1624: 1617: 1235: 771: 758:

Representations can be done in one of two formats – a

351: 68: 1810:

is appended directly to the time instead of "Z" suffix above; other

7188: 4329: 1242:

from 1900 to 1999 inclusive. Although the standard allows both the

7735: 7710: 7432: 7317: 6969: 6834: 6706: 6681: 6676: 6656: 6030: 6000: 5995: 5716: 5701: 5691: 5686: 5510: 5322: 5221: 5176: 3001: 2826: 2781: 2452:

Some Truncated Representations (last valid in ISO 8601:2000)

2337:

Start and end, such as "2007-03-01T13:00:00Z/2008-05-11T15:30:00Z"

2251: 2027:

does not have a minus sign, so its hyphen-minus character (code 45

2024: 1966: 1956: 1946: 1850: 1332:, from 1 through 7, beginning with Monday and ending with Sunday. 1024: 356: 3627: 3602:. DIN-Normenausschuss Informationstechnik und Anwendungen (NIA). 3423:. DIN-Normenausschuss Informationstechnik und Anwendungen (NIA). 2340:

Start and duration, such as "2007-03-01T13:00:00Z/P1Y2M10DT2H30M"

1437:, a sequential count of the number of days since day 0 beginning 976: 948: 920: 892: 864: 836: 589:

The first edition of the ISO 8601 standard was published as

7382: 7245: 7238: 6904: 6849: 6449: 6060: 5515: 5500: 5490: 4944: 4881: 3961:"A summary of the international standard date and time notation" 3713:. Sausalito, California: University Science Books. p. 580. 2765: 2031:) would be used. If the character set has a minus sign, such as 2007:

To represent a negative offset, ISO 8601 specifies using a

1837:

where the civil time is behind UTC. So the zone designation for

1610: 513: 58: 33: 5623: 4854: 4127:"3.4.1 Characters used in the representations - Introduction". 3707:

Doggett, L. E. (1992). "Calendars". In P. K. Seidelmann (ed.).

2343:

Duration and end, such as "P1Y2M10DT2H30M/2008-05-11T15:30:00Z"

2274:. However, individual date and time values cannot exceed their 1445:

which uses the Gregorian proleptic calendar with a year 0000).

1441:

Greenwich noon, Julian proleptic calendar (or noon on ISO date

7869: 7559: 6611: 5495: 2777: 2721:

Time intervals with an open (unbounded) end or an unknown end.

1846: 1815: 1795: 1739: 437: 424: 4330:"Info on ISO 8601, the date and time representation standard" 2350:

Of these, the first three require two values separated by an

1010:, which "serves as an international standard for civil use." 2898:

Source ICONTEC (This standard is identical to ISO 8601:2004)

2809:

IETF RFC 3339 defines a profile of ISO 8601 for use in

2689:

The first and seventh examples given above omit the leading

1627:

between 00 and 60 (where 60 is only used to denote an added

527:

ISO 8601 applies to these representations and formats:

2354:

which is usually a solidus (more commonly referred to as a

1265:

7 January 2000 can be written as "2000-01-07" or "20000107"

1073: 621:

published on 1 December 2004, and withdrawn and revised by

4950:

International Earth Rotation and Reference Systems Service

4784:

The 2016 prototype of ISO 8601-2 (ISO/TC 154 N) (archived)

4779:

The 2016 prototype of ISO 8601-1 (ISO/TC 154 N) (archived)

4051:

ISO 8601-1:2019 section 3.2.4, ISO 8601:2004 section 3.4.2

2674:

A specific minute and decimal fraction of the implied hour

2084:

as a delimiter, and a valid time expression. For example,

4060:

RFC 3339 – Unknown local offset convention

4602:"CAN/CSA-Z234.4-89 (R2007): All-Numeric Dates and Times" 2817:. It explicitly excludes durations and dates before the 819: 2270:. For example, the first duration shown above would be 828: 822: 4835:

illustrating the difference between the two standards.

4789:

Use international date format (ISO) – Quality Web Tips

3110:ГОСТ ИСО 8601-2001 (current), ГОСТ 7.64-90 (obsolete) 2948:

EN ISO 8601, EN 28601:1992 (cancelled 7 October 2011)

2564:

A specific year and ordinal day in the implied century

2186:) placed at the start of the duration representation. 816: 408:

Current date and time expressed according to ISO 8601

3648:

Wolf, Misha; Wicksteed, Charles (15 September 1997).

2724:

Exponential and significant figure notation in years.

2088:. In ISO 8601:2004 it was permitted to omit the 1238:

from 1980 to 1989 inclusive, or "19" to refer to the

831: 825: 813: 508:

covering the worldwide exchange and communication of

4379:

Note about Date and Time Formats to W3C from Reuters

1814:

zone letters are not used. The offset is applied to

572:

In representations that adhere to the ISO 8601

7852: 7578: 6730: 5679: 5554: 5445: 5412: 5386: 5267: 5167: 5084: 5058: 4915: 3369:"Introduction to the new ISO 8601-1 and ISO 8601-2" 489: 481: 471: 448: 435: 422: 414: 3710:Explanatory Supplement to the Astronomical Almanac 3199:ANSI INCITS 30-1997 (R2008) and NIST FIPS PUB 4-2 1635:So a time might appear as either "T134730" in the 1148:Only allowed in the (now superseded) 2000 version: 4115:RFC2822 describes a similar convention for email 1314:which is slightly different from the traditional 796:to the smallest time value in the representation. 4070:Newman, Chris (July 2002). Klyne, Graham (ed.). 3689:Earlier versions of ISO 8601 used the word 3507:"Extended Date/Time Format (EDTF) 1.0 2012/2014" 3449:"Extended Date/Time Format (EDTF) Specification" 3443: 3441: 3242:ISO 8601 and computing differences between dates 3142:SN ISO 8601:2005-08 (replaced SN-EN 28601:1994) 2643:A specific minute and second of the implied hour 2491:A specific year and month in the implied century 2333:There are four ways to express a time interval: 4846:ISO 8601 Implementation Around The World (1998) 4355:"ISO 8601 - Getting with the Times (and Dates)" 3986:"Communication Instructions General ACP 121(I)" 3078:AS/NZS ISO 8601.1:2021, AS/NZS ISO 8601.2:2021 3046:LST ISO 8601:2006 (replaced LST ISO 8601:1997) 2964:NF Z69-200; NF EN 28601:1993-06-01 (cancelled) 2832:Building upon the foundations of RFC 3339, the 1378:Monday 29 December 2008 is written "2009-W01-1" 4528:. April 2001. p. 14. sec. 3.3. 2788:makes use of another subset of ISO 8601. 2595:A specific year and week in the implied decade 2362:; in common operating systems, a solidus is a 1251: 518:International Organization for Standardization 5635: 4866: 3789:For example, see Annex B.1.1 of the standard. 3478:"Extended Date/Time Format (EDTF) Background" 3265: 3263: 3261: 2522:A specific day of a month in the implied year 1661:T, when both seconds and minutes are omitted. 1381:Sunday 3 January 2010 is written "2009-W53-7" 999: 996: 993: 990: 987: 984: 981: 971: 968: 965: 962: 959: 956: 953: 943: 940: 937: 934: 931: 928: 925: 915: 912: 909: 906: 903: 900: 897: 887: 884: 881: 878: 875: 872: 869: 859: 856: 853: 850: 847: 844: 841: 664:History of published editions and amendments 613:. It has been superseded by a second edition 388: 8: 3893:ISO 8601-1:2019 section 3.1.3.9 Decimal sign 3622: 3620: 3070:NEN ISO 8601, NEN EN 28601 (1994), NEN 2772 2693:for century. Other formats have one leading 1014: 407: 4186:"Date and Time on the Internet: Timestamps" 4025:Time: From Earth Rotation to Atomic Physics 3191:BS ISO 8601:2004, BS EN 28601 (1989-06-30) 2612:A specific week and day in the implied year 1582:* Unambiguous here because they are in the 1103:) notation; by convention 1 BC is labelled 27:International standards for dates and times 5642: 5628: 5620: 4873: 4859: 4851: 4467:Newman, Chris; Klyne, Graham (July 2002). 4423:Newman, Chris; Klyne, Graham (July 2002). 2581:A specific ordinal day in the implied year 2048:, then that character should be used. The 804: 762:with a minimal number of separators or an 662: 395: 381: 29: 4571: 4556:Sharma, Ujjwal; Bormann, Carsten (2024). 4533: 4486: 4474:Date and Time on the Internet: Timestamps 4438: 4426:Date and Time on the Internet: Timestamps 4205: 4140:. 2016-02-16. p. 12. ISO/WD 8601-1. 4073:Date and Time on the Internet: Timestamps 3993:Combined Communications Electronics Board 3298: 3296: 2864:ÖNORM ISO 8601 (replaced ÖNORM EN 28601) 2740:Repeat rules for recurring time intervals 1775:directly after the time without a space. 5404:International Commission on Stratigraphy 4814:The Mathematics of the ISO 8601 Calendar 4399:"ID3 tag version 2.4.0 - Main Structure" 3680:ISO 8601:2004 section 2.3.3 basic format 2930:DS/ISO 8601:2005 (replaced DS/EN 28601) 2849: 2450: 2430:"R5/2008-03-01T13:00:00Z/P1Y2M10DT2H30M" 1597:system. As of ISO 8601-1:2019, the 1586:section of this Knowledge (XXG) article. 4825:, specifying a profile of ISO 8601:1988 4653:"DOF - Diario Oficial de la Federación" 3844:"RFC 6350 - vCard Format Specification" 3802:"RFC 6350 - vCard Format Specification" 3286: 3284: 3257: 3227:Date and time representation by country 2730:Syntax for serializing a list of dates. 2660:A specific second of the implied minute 516:-related data. It is maintained by the 32: 4401:. id3.org. pp. §4. Archived from 3748:. 2004-12-01. section 4.1.2.1 General. 2508:A specific year in the implied century 2474:A specific date in the implied century 2441: 2436:Truncated representations (deprecated) 2400: 2304: 2118: 2070: 2067:Combined date and time representations 1997:may also be used if it is available. 1710: 1452: 1389: 1279: 1114: 1045: 810: 406: 4816:from the website of R.H. van Gent of 4762:ISO's catalog entry for ISO 8601:2004 3780:ISO 8601:2004 sections 3.4.2, 4.1.2.4 2547: 524:for writing numeric dates and times. 7: 4100:from the original on 20 January 2021 4029:Wiley-VCH Verlag GmbH & Co. KGaA 2539:A specific month in the implied year 2092:character by mutual agreement as in 1853:will be "+02:00","+0200", or "+02". 1107:, 2 BC is labeled −0001, and so on. 522:countries with different conventions 4791:The World Wide Web Consortium (W3C) 4192:. §5.6. Internet Date/Time Format. 3832:, although removed in ISO 8601:2004 2553:A specific day in the implied month 4612:from the original on 30 March 2018 3332:. 2004-12-01. p. iv Foreword. 2629:A specific day in the implied week 2366:and is not allowed in a filename. 1833:describes a time zone west of the 1672:earlier versions of the standard. 25: 5124:Discrete time and continuous time 4823:W3C "NOTE": Date and Time Formats 4481:. p. 8. sec. 5.6. 4184:G. Klyne; C. Newman (July 2002). 4147:from the original on 2022-10-05. 4023:; Seidelmann, Kenneth P. (2009). 3798:last in ISO 8601:2000, in use by 1826:in the format '±:', '±', or '±'. 7933: 7932: 5049: 5043: 4276:Java Platform Standard Edition 8 3842:Perreault, Simon (August 2011). 3662:from the original on 10 May 2021 2709:Extended Date/Time Format (EDTF) 2182:is the duration designator (for 1984:Other time offset specifications 1763:Coordinated Universal Time (UTC) 1328:, from W01 through W53. is the 40: 4716:from the original on 2021-11-24 4659:from the original on 2021-11-10 4361:from the original on 2014-01-25 4336:from the original on 2017-10-14 4311:from the original on 2017-10-14 4282:from the original on 2017-10-14 4241:from the original on 2021-03-12 4002:from the original on 2018-01-16 3967:from the original on 2022-10-05 3941:from the original on 2021-10-20 3864:from the original on 2016-05-31 3820:from the original on 2016-05-31 3628:ISO 8601 — Date and time format 3606:from the original on 2017-10-19 3488:from the original on 2020-03-07 3459:from the original on 2020-03-07 3427:from the original on 2017-10-20 3350:from the original on 2016-05-25 2313:<start>/<duration> 5197:History of timekeeping devices 2938:EVS 8:2008; EVS-ISO 8601:2011 2846:Adoption as national standards 1849:. So the zone designation for 1349:the week with 4 January in it, 748:by, for example, file systems. 1: 4599:National Standard of Canada, 4516:"Date and Time Specification" 3800:Perreault, S. (August 2011). 3346:. Technical committees. ISO. 3290:ISO 8601:2004 section 1 Scope 2996:IST EN 28601:1992 (obsolete) 2318:<duration>/<end> 569:(excludes images or sounds). 449:Date and time with the offset 326:Ultimate fate of the universe 7964:Date and time representation 4677:Czubla, Albin (2020-12-04). 1742:, or as an offset from UTC. 1032:proleptic Gregorian calendar 617:in 2000, by a third edition 5144:Gravitational time dilation 4980:Barycentric Coordinate Time 4706:"SANS 8601:2009 (Ed. 2.00)" 4606:Standards Council of Canada 4469:"Internet Date/Time Format" 3566:"ISO/DIS 8601-2:2016-10-26" 3387:"ISO/DIS 8601-1:2016-10-26" 3222:Astronomical year numbering 3175:(Accepted from 2021-02-15) 2391:"2007-11-13T00:00/16T00:00" 2387:"2007-11-13T09:00/15T17:00" 2132:P<date>T<time> 1658:, when seconds are omitted. 1078:astronomical year numbering 7995: 5000:Geocentric Coordinate Time 4985:Barycentric Dynamical Time 4923:Coordinated Universal Time 4810: (archived 2011-06-14) 4773:Preview of ISO 8601-2:2019 4767:Preview of ISO 8601-1:2019 4397:Nilsson, M. (2000-11-01). 3959:Markus Kuhn (2020-06-16). 3536:"ISO/WD 8601-2:2016-02-16" 3271:ISO 8601-1:2019/Amd 1:2022 2888:CAN/CSA-Z234.4-89 (R2007) 2439: 2308:<start>/<end> 2074:<date>T<time> 1318:year (see below). is the 1273: 1087:To represent years before 725:ISO 8601-1:2019/Amd 1:2022 545:24-hour timekeeping system 464:2024-09-20T10:55:40+12:00 458:2024-09-19T22:55:40+00:00 452:2024-09-19T10:55:40−12:00 7928: 5661: 5154:Time-translation symmetry 5041: 4965:International Atomic Time 4892: 4357:. Hydrogold. 2012-01-01. 2841:1996-12-19T16:39:57-08:00 2762:World Wide Web Consortium 2682: 2668: 2637: 2589: 2516: 2377:can start at any time on 1580: 1525: 1146: 1137: 650:Extended Date/Time Format 649: 638:most-to-least-significant 18:International Date Format 7979:Time measurement systems 4797:by Dr. Markus Kuhn from 2774:electronic program guide 2442:§ Reduced precision 2440:Not to be confused with 2105:"2007-04-05T12:30−02:00" 1746:Local time (unqualified) 1623:refers to a zero-padded 1616:refers to a zero-padded 1609:refers to a zero-padded 1527:In unambiguous contexts* 1339:the week with the first 1252:truncated representation 685:ISO 8601:1988/COR 1:1991 535:calendar (including the 5414:Astronomical chronology 5387:Archaeology and geology 5094:Absolute space and time 5010:IERS Reference Meridian 5005:International Date Line 4916:International standards 4840:Implementation overview 4521:Internet Message Format 4301:"Amazon Alexa Duration" 4272:"Java 8 Class Duration" 4232:The Library of Congress 3650:"Date and Time Formats" 3511:The Library of Congress 3482:The Library of Congress 3453:The Library of Congress 2701:Standardised extensions 2381:and end at any time on 1593:ISO 8601 uses the 1368:ISO week-numbering year 1324:prefixed by the letter 1312:ISO week-numbering year 631:ISO Technical Committee 4804:Summary of 8601 by ISO 3232:Date format by country 2426:"2008-03-01T13:00:00Z" 2272:"P0003-06-04T12:30:05" 1798:depending on context. 1639:or "T13:47:30" in the 1030:Earlier dates, in the 1015: 1006:The standard uses the 565:), or that do not use 506:international standard 7959:Calendaring standards 5373:Weekday determination 5259:Sundial markup schema 3158:TIS 1111:2535 (1992) 3062:NMX-CH-150-IMNC-1999 2050:HTML character entity 1802:Time offsets from UTC 1707:Time zone designators 1223:or "19810405" in the 742:lexicographical order 5394:Chronological dating 5134:Theory of relativity 4995:Daylight saving time 4829:RFC 3339 vs ISO 8601 4799:Cambridge University 4735:"SS-ISO 8601-1:2022" 4608:. 31 December 1989. 3509:. Draft Submission. 3252:Notes and references 3022:UNI EN 28601 (1993) 2872:NBN EN 28601 (1993) 2784:encoding standard's 2404:Rn/<interval> 2260:Daylight saving time 1913:daylight saving time 1757:daylight saving time 627:ISO 8601-2:2019 623:ISO 8601-1:2019 574:interchange standard 442:2024-09-19T22:55:40Z 5604:Time value of money 5399:Geologic time scale 5254:History of sundials 5119:Cosmological decade 5071:Greenwich Mean Time 4902:Orders of magnitude 4679:"Główny Urząd Miar" 4021:McCarthy, Dennis D. 3937:. 3 December 2008. 3574:Library of Congress 3544:Library of Congress 3395:Library of Congress 3183:ДСТУ ISO 8601:2010 3035:Korea, Republic of 2453: 2409:R/<interval> 2397:Repeating intervals 2352:interval designator 2101:"2007-04-05T14:30Z" 1974:List of UTC offsets 1937:British Summer Time 1880:Additional examples 1792:Greenwich Mean Time 1719:<time>±hh:mm 1685:dot on the baseline 1016:Convention du Mètre 807: 665: 660:of a calendar day. 567:computer characters 537:proleptic Gregorian 411: 7974:Specific calendars 5655:by standard number 5579:Mental chronometry 5207:Marine chronometer 5059:Obsolete standards 4818:Utrecht University 4384:2011-08-24 at the 3634:2013-03-08 at the 3126:UNE EN 28601:1995 2988:MSZ ISO 8601:2003 2903:2020-01-16 at the 2811:Internet protocols 2451: 2364:reserved character 2086:"2007-04-05T14:30" 1822:in the designated 1767:If the time is in 1724:<time>±hhmm 1620:between 00 and 59. 1613:between 00 and 24. 1316:Gregorian calendar 1082:Gregorian calendar 1008:Gregorian calendar 805: 735:General principles 663: 619:ISO 8601:2004 615:ISO 8601:2000 591:ISO 8601:1988 320:Radiometric dating 7946: 7945: 5669:ISO romanizations 5617: 5616: 5427:Nuclear timescale 5109:Continuous signal 4686:Główny Urząd Miar 4038:978-3-527-40780-4 3925:"ISO 8601 Format" 3375:. 26 August 2019. 3213: 3212: 3014:IS/EN 28601:1993 2687: 2686: 2469:Extended example 2413: 2412: 2327: 2326: 2323:<duration> 2136: 2135: 2078: 2077: 2019:should be used, ( 1991:plus-minus-sign ( 1733: 1732: 1591: 1590: 1587: 1439:1 January 4713 BC 1405: 1404: 1308: 1307: 1212: 1211: 1066:year 2000 problem 1062: 1061: 1004: 1003: 732: 731: 499: 498: 482:Week with weekday 436:Date and time in 410: 405: 404: 16:(Redirected from 7986: 7936: 7935: 5656: 5644: 5637: 5630: 5621: 5318:Dominical letter 5249:Equation of time 5212:Marine sandglass 5053: 5047: 5025:Terrestrial Time 4882:Time measurement 4875: 4868: 4861: 4852: 4795:ISO 8601 summary 4749: 4748: 4746: 4745: 4731: 4725: 4724: 4722: 4721: 4702: 4696: 4695: 4693: 4692: 4683: 4674: 4668: 4667: 4665: 4664: 4649: 4643: 4642: 4640: 4639: 4628: 4622: 4621: 4619: 4617: 4597: 4591: 4590: 4588: 4587: 4575: 4573:10.17487/RFC9557 4553: 4547: 4546: 4537: 4535:10.17487/RFC2822 4512: 4506: 4505: 4503: 4502: 4490: 4488:10.17487/RFC3339 4464: 4458: 4457: 4455: 4454: 4442: 4440:10.17487/RFC3339 4420: 4414: 4413: 4411: 4410: 4394: 4388: 4376: 4370: 4369: 4367: 4366: 4351: 4345: 4344: 4342: 4341: 4326: 4320: 4319: 4317: 4316: 4305:Amazon Developer 4297: 4291: 4290: 4288: 4287: 4268: 4262: 4259: 4253: 4252: 4247: 4246: 4240: 4229: 4221: 4215: 4214: 4209: 4198:10.17487/RFC3339 4190:Ietf Datatracker 4181: 4175: 4174: 4159: 4153: 4152: 4146: 4135: 4124: 4118: 4117: 4107: 4105: 4086:10.17487/RFC3339 4067: 4061: 4058: 4052: 4049: 4043: 4042: 4017: 4011: 4010: 4008: 4007: 4001: 3995:. October 2010. 3990: 3982: 3976: 3975: 3973: 3972: 3956: 3950: 3949: 3947: 3946: 3921: 3915: 3914: 3904:ISO 8601:2004(E) 3900: 3894: 3891: 3885: 3882: 3876: 3875: 3870: 3869: 3858:10.17487/RFC6350 3852:. §4.3.1. DATE. 3839: 3833: 3831: 3826: 3825: 3814:10.17487/RFC6350 3796: 3790: 3787: 3781: 3778: 3772: 3771: 3760:ISO 8601:2004(E) 3756: 3750: 3749: 3742:ISO 8601:2004(E) 3738: 3732: 3731: 3723:. Archived from 3704: 3698: 3687: 3681: 3678: 3672: 3671: 3669: 3667: 3645: 3639: 3624: 3615: 3614: 3612: 3611: 3592: 3586: 3585: 3583: 3577:. Archived from 3570: 3562: 3556: 3555: 3553: 3547:. Archived from 3540: 3532: 3526: 3525: 3523: 3522: 3513:. Archived from 3503: 3497: 3496: 3494: 3493: 3474: 3468: 3467: 3465: 3464: 3445: 3436: 3435: 3433: 3432: 3413: 3407: 3406: 3404: 3398:. Archived from 3391: 3383: 3377: 3376: 3365: 3359: 3358: 3356: 3355: 3340: 3334: 3333: 3326:ISO 8601:2004(E) 3322: 3316: 3315: 3304:ISO 8601:2004(E) 3300: 3291: 3288: 3279: 3278: 3267: 3208:TCVN 6398-1:1998 3030:JIS X 0301:2002 2850: 2842: 2796:As of 2006, the 2696: 2692: 2454: 2431: 2427: 2401: 2392: 2388: 2384: 2380: 2376: 2305: 2273: 2269: 2119: 2106: 2102: 2095: 2087: 2071: 2059: 2055: 2043: 2040: 2037: 2035: 2022: 2012: 1994: 1729:<time>±hh 1711: 1581: 1453: 1444: 1440: 1428: 1424: 1421:). For example, 1390: 1280: 1257: 1249: 1245: 1233: 1218: 1208: 1201: 1186: 1171: 1156: 1135: 1120: 1115: 1046: 1023:) was signed in 1021:Metre Convention 1018: 979: 951: 923: 895: 867: 839: 808: 794:decimal fraction 781: 666: 643: 563:Chinese calendar 547:, with optional 444:20240919T225540Z 412: 409: 397: 390: 383: 327: 211:Day of Judgement 44: 30: 21: 7994: 7993: 7989: 7988: 7987: 7985: 7984: 7983: 7949: 7948: 7947: 7942: 7924: 7848: 7574: 6726: 5675: 5657: 5654: 5648: 5618: 5613: 5550: 5441: 5408: 5382: 5263: 5163: 5114:Coordinate time 5086:Time in physics 5080: 5054: 5048: 5039: 4911: 4888: 4879: 4808:Wayback Machine 4758: 4753: 4752: 4743: 4741: 4733: 4732: 4728: 4719: 4717: 4704: 4703: 4699: 4690: 4688: 4681: 4676: 4675: 4671: 4662: 4660: 4651: 4650: 4646: 4637: 4635: 4630: 4629: 4625: 4615: 4613: 4600: 4598: 4594: 4585: 4583: 4555: 4554: 4550: 4514: 4513: 4509: 4500: 4498: 4466: 4465: 4461: 4452: 4450: 4422: 4421: 4417: 4408: 4406: 4396: 4395: 4391: 4386:Wayback Machine 4377: 4373: 4364: 4362: 4353: 4352: 4348: 4339: 4337: 4328: 4327: 4323: 4314: 4312: 4299: 4298: 4294: 4285: 4283: 4270: 4269: 4265: 4260: 4256: 4244: 4242: 4238: 4227: 4223: 4222: 4218: 4183: 4182: 4178: 4161: 4160: 4156: 4144: 4133: 4126: 4125: 4121: 4103: 4101: 4069: 4068: 4064: 4059: 4055: 4050: 4046: 4039: 4019: 4018: 4014: 4005: 4003: 3999: 3988: 3984: 3983: 3979: 3970: 3968: 3958: 3957: 3953: 3944: 3942: 3923: 3922: 3918: 3902: 3901: 3897: 3892: 3888: 3883: 3879: 3867: 3865: 3841: 3840: 3836: 3823: 3821: 3799: 3797: 3793: 3788: 3784: 3779: 3775: 3758: 3757: 3753: 3740: 3739: 3735: 3727:on 2004-04-01. 3721: 3706: 3705: 3701: 3688: 3684: 3679: 3675: 3665: 3663: 3647: 3646: 3642: 3636:Wayback Machine 3625: 3618: 3609: 3607: 3594: 3593: 3589: 3581: 3568: 3564: 3563: 3559: 3551: 3538: 3534: 3533: 3529: 3520: 3518: 3505: 3504: 3500: 3491: 3489: 3484:. 2019-10-08 . 3476: 3475: 3471: 3462: 3460: 3455:. 2019-10-08 . 3447: 3446: 3439: 3430: 3428: 3415: 3414: 3410: 3402: 3389: 3385: 3384: 3380: 3367: 3366: 3362: 3353: 3351: 3342: 3341: 3337: 3324: 3323: 3319: 3302: 3301: 3294: 3289: 3282: 3269: 3268: 3259: 3254: 3218: 3188:United Kingdom 3118:SANS 8601:2009 2919:Czech Republic 2914:GB/T 7408-2005 2905:Wayback Machine 2848: 2840: 2807: 2794: 2786:GeneralizedTime 2764:(W3C) uses the 2754: 2703: 2694: 2690: 2466:Extended format 2445: 2438: 2429: 2425: 2399: 2390: 2386: 2382: 2378: 2375:"2007-11-13/15" 2374: 2303: 2271: 2267: 2122:PnYnMnDTnHnMnS 2117: 2104: 2100: 2093: 2085: 2069: 2057: 2053: 2052:invocation for 2041: 2038: 2033: 2032: 2030: 2020: 2010: 1992: 1986: 1882: 1804: 1765: 1748: 1709: 1656:extended format 1641:extended format 1603:extended format 1451: 1442: 1438: 1426: 1425:is the same as 1422: 1388: 1278: 1272: 1255: 1247: 1243: 1231: 1221:extended format 1216: 1206: 1199: 1184: 1169: 1154: 1133: 1118: 1113: 1072:and all others 1044: 1036:Julian calendar 977: 949: 921: 893: 865: 837: 806:September 2024 803: 779: 764:extended format 737: 717:ISO 8601-2:2019 709:ISO 8601-1:2019 641: 587: 578:Arabic numerals 543:, based on the 462: 456: 443: 430: 401: 372: 371: 347: 346: 337: 336: 332:Time in physics 325: 300: 299: 298: 279: 278: 259: 258: 257: 236: 235: 196: 195: 194: 175: 174: 150: 149: 138: 137: 98: 97: 96:Fields of study 88: 87: 54: 53: 28: 23: 22: 15: 12: 11: 5: 7992: 7990: 7982: 7981: 7976: 7971: 7966: 7961: 7951: 7950: 7944: 7943: 7941: 7940: 7929: 7926: 7925: 7923: 7922: 7917: 7912: 7907: 7902: 7897: 7892: 7887: 7882: 7877: 7872: 7867: 7862: 7856: 7854: 7850: 7849: 7847: 7846: 7841: 7836: 7831: 7828: 7823: 7818: 7813: 7808: 7803: 7798: 7793: 7788: 7783: 7778: 7773: 7768: 7763: 7758: 7753: 7748: 7743: 7738: 7733: 7728: 7723: 7718: 7713: 7708: 7703: 7698: 7693: 7688: 7683: 7678: 7673: 7668: 7663: 7658: 7653: 7648: 7643: 7638: 7633: 7628: 7623: 7618: 7613: 7608: 7603: 7598: 7593: 7588: 7582: 7580: 7576: 7575: 7573: 7572: 7567: 7562: 7557: 7552: 7547: 7542: 7537: 7532: 7527: 7522: 7517: 7512: 7507: 7502: 7497: 7492: 7487: 7482: 7477: 7472: 7467: 7462: 7457: 7456: 7455: 7450: 7440: 7435: 7430: 7425: 7420: 7415: 7410: 7405: 7400: 7395: 7390: 7385: 7380: 7375: 7370: 7365: 7360: 7355: 7350: 7345: 7340: 7335: 7330: 7325: 7320: 7315: 7310: 7305: 7300: 7295: 7290: 7285: 7284: 7283: 7273: 7268: 7263: 7258: 7253: 7248: 7243: 7242: 7241: 7236: 7226: 7221: 7216: 7211: 7206: 7201: 7196: 7191: 7186: 7181: 7176: 7171: 7166: 7161: 7156: 7155: 7154: 7149: 7144: 7139: 7134: 7129: 7124: 7119: 7114: 7104: 7099: 7094: 7089: 7084: 7079: 7074: 7069: 7064: 7059: 7054: 7049: 7044: 7039: 7034: 7029: 7024: 7019: 7014: 7009: 7008: 7007: 7002: 6992: 6987: 6982: 6977: 6972: 6967: 6962: 6957: 6952: 6947: 6937: 6932: 6927: 6922: 6917: 6912: 6907: 6902: 6897: 6892: 6887: 6882: 6877: 6872: 6867: 6862: 6857: 6852: 6847: 6842: 6837: 6832: 6827: 6822: 6821: 6820: 6815: 6810: 6805: 6800: 6790: 6785: 6780: 6775: 6770: 6765: 6760: 6755: 6750: 6745: 6740: 6734: 6732: 6728: 6727: 6725: 6724: 6719: 6714: 6709: 6704: 6699: 6694: 6689: 6684: 6679: 6674: 6669: 6664: 6659: 6654: 6649: 6644: 6639: 6634: 6629: 6624: 6619: 6614: 6609: 6604: 6599: 6594: 6593: 6592: 6587: 6582: 6577: 6572: 6567: 6562: 6557: 6552: 6547: 6542: 6537: 6532: 6527: 6522: 6517: 6512: 6502: 6497: 6492: 6487: 6482: 6477: 6472: 6467: 6462: 6457: 6452: 6447: 6442: 6437: 6432: 6427: 6422: 6417: 6412: 6407: 6402: 6397: 6392: 6387: 6382: 6377: 6376: 6375: 6365: 6360: 6355: 6350: 6345: 6340: 6335: 6330: 6325: 6320: 6315: 6310: 6305: 6300: 6295: 6290: 6285: 6280: 6275: 6270: 6265: 6260: 6255: 6250: 6245: 6240: 6235: 6230: 6225: 6220: 6215: 6210: 6205: 6200: 6195: 6190: 6185: 6180: 6175: 6170: 6165: 6160: 6155: 6154: 6153: 6148: 6143: 6133: 6128: 6123: 6118: 6113: 6108: 6103: 6098: 6093: 6088: 6083: 6078: 6073: 6068: 6063: 6058: 6053: 6048: 6043: 6038: 6033: 6028: 6023: 6018: 6013: 6008: 6003: 5998: 5993: 5988: 5983: 5978: 5973: 5968: 5963: 5958: 5953: 5948: 5943: 5938: 5933: 5928: 5923: 5918: 5913: 5912: 5911: 5906: 5901: 5896: 5891: 5881: 5876: 5871: 5866: 5861: 5856: 5851: 5846: 5841: 5836: 5831: 5826: 5821: 5816: 5811: 5806: 5801: 5800: 5799: 5794: 5789: 5784: 5779: 5774: 5769: 5764: 5759: 5754: 5749: 5744: 5739: 5729: 5724: 5719: 5714: 5709: 5704: 5699: 5694: 5689: 5683: 5681: 5677: 5676: 5662: 5659: 5658: 5649: 5647: 5646: 5639: 5632: 5624: 5615: 5614: 5612: 5611: 5606: 5601: 5599:Time metrology 5596: 5591: 5586: 5581: 5576: 5575: 5574: 5564: 5558: 5556: 5555:Related topics 5552: 5551: 5549: 5548: 5543: 5538: 5533: 5528: 5523: 5518: 5513: 5508: 5503: 5498: 5493: 5488: 5483: 5478: 5473: 5468: 5463: 5458: 5452: 5450: 5443: 5442: 5440: 5439: 5434: 5429: 5424: 5418: 5416: 5410: 5409: 5407: 5406: 5401: 5396: 5390: 5388: 5384: 5383: 5381: 5380: 5375: 5370: 5365: 5360: 5355: 5350: 5345: 5340: 5335: 5330: 5325: 5320: 5315: 5310: 5305: 5300: 5294: 5289: 5284: 5279: 5273: 5271: 5265: 5264: 5262: 5261: 5256: 5251: 5246: 5244:Dialing scales 5241: 5236: 5231: 5230: 5229: 5219: 5214: 5209: 5204: 5199: 5194: 5189: 5184: 5179: 5173: 5171: 5165: 5164: 5162: 5161: 5156: 5151: 5146: 5141: 5136: 5131: 5126: 5121: 5116: 5111: 5106: 5101: 5096: 5090: 5088: 5082: 5081: 5079: 5078: 5076:Prime meridian 5073: 5068: 5066:Ephemeris time 5062: 5060: 5056: 5055: 5042: 5040: 5038: 5037: 5035:180th meridian 5032: 5027: 5022: 5017: 5012: 5007: 5002: 4997: 4992: 4987: 4982: 4977: 4972: 4967: 4962: 4957: 4952: 4947: 4942: 4937: 4932: 4931: 4930: 4919: 4917: 4913: 4912: 4910: 4909: 4904: 4899: 4893: 4890: 4889: 4880: 4878: 4877: 4870: 4863: 4855: 4849: 4848: 4837: 4836: 4826: 4820: 4811: 4801: 4792: 4786: 4781: 4776: 4770: 4764: 4757: 4756:External links 4754: 4751: 4750: 4726: 4697: 4669: 4644: 4623: 4592: 4548: 4507: 4459: 4415: 4389: 4371: 4346: 4321: 4307:. Amazon.com. 4292: 4263: 4254: 4234:. p. 23. 4216: 4176: 4169:. 2004-12-01. 4154: 4119: 4062: 4053: 4044: 4037: 4031:. p. 10. 4012: 3977: 3951: 3934:Microsoft Docs 3916: 3910:, 2004-12-01, 3895: 3886: 3877: 3834: 3791: 3782: 3773: 3766:. 2004-12-01. 3751: 3733: 3719: 3699: 3682: 3673: 3640: 3616: 3596:"German draft 3587: 3584:on 2017-10-20. 3557: 3554:on 2017-10-19. 3527: 3498: 3469: 3437: 3417:"German draft 3408: 3405:on 2017-10-19. 3378: 3360: 3335: 3317: 3310:, 2004-12-01, 3292: 3280: 3256: 3255: 3253: 3250: 3249: 3248: 3239: 3234: 3229: 3224: 3217: 3214: 3211: 3210: 3205: 3201: 3200: 3197: 3196:United States 3193: 3192: 3189: 3185: 3184: 3181: 3177: 3176: 3166: 3160: 3159: 3156: 3152: 3151: 3148: 3144: 3143: 3140: 3136: 3135: 3132: 3128: 3127: 3124: 3120: 3119: 3116: 3112: 3111: 3108: 3104: 3103: 3100: 3096: 3095: 3092: 3088: 3087: 3084: 3080: 3079: 3076: 3072: 3071: 3068: 3064: 3063: 3060: 3056: 3055: 3052: 3048: 3047: 3044: 3040: 3039: 3038:KS X ISO 8601 3036: 3032: 3031: 3028: 3024: 3023: 3020: 3016: 3015: 3012: 3008: 3007: 3004: 2998: 2997: 2994: 2990: 2989: 2986: 2982: 2981: 2980:ELOT EN 28601 2978: 2974: 2973: 2970: 2966: 2965: 2962: 2958: 2957: 2954: 2950: 2949: 2946: 2940: 2939: 2936: 2932: 2931: 2928: 2924: 2923: 2920: 2916: 2915: 2912: 2908: 2907: 2896:NTC 1034:2014 2894: 2890: 2889: 2886: 2882: 2881: 2880:NBR 5892:2019 2878: 2874: 2873: 2870: 2866: 2865: 2862: 2858: 2857: 2854: 2847: 2844: 2806: 2803: 2793: 2790: 2753: 2750: 2749: 2748: 2741: 2737: 2736: 2733: 2732: 2731: 2728: 2725: 2722: 2719: 2710: 2702: 2699: 2685: 2684: 2681: 2678: 2675: 2671: 2670: 2667: 2664: 2661: 2657: 2656: 2653: 2650: 2647: 2644: 2640: 2639: 2636: 2633: 2630: 2626: 2625: 2622: 2619: 2616: 2613: 2609: 2608: 2605: 2602: 2599: 2596: 2592: 2591: 2588: 2585: 2582: 2578: 2577: 2574: 2571: 2568: 2565: 2561: 2560: 2557: 2554: 2550: 2549: 2546: 2543: 2540: 2536: 2535: 2532: 2529: 2526: 2523: 2519: 2518: 2515: 2512: 2509: 2505: 2504: 2501: 2498: 2495: 2492: 2488: 2487: 2484: 2481: 2478: 2475: 2471: 2470: 2467: 2464: 2461: 2458: 2437: 2434: 2411: 2410: 2406: 2405: 2398: 2395: 2348: 2347: 2344: 2341: 2338: 2325: 2324: 2320: 2319: 2315: 2314: 2310: 2309: 2302: 2301:Time intervals 2299: 2295: 2294: 2291: 2240: 2239: 2238: 2237: 2231: 2225: 2213: 2212: 2211: 2205: 2199: 2193: 2134: 2133: 2129: 2128: 2124: 2123: 2116: 2113: 2094:"200704051430" 2076: 2075: 2068: 2065: 2028: 1985: 1982: 1970: 1969: 1959: 1949: 1939: 1925: 1915: 1893: 1881: 1878: 1835:prime meridian 1803: 1800: 1788:Zulu time zone 1764: 1761: 1747: 1744: 1731: 1730: 1726: 1725: 1721: 1720: 1716: 1715: 1714:<time>Z 1708: 1705: 1663: 1662: 1659: 1633: 1632: 1621: 1614: 1589: 1588: 1578: 1577: 1575: 1573: 1569: 1568: 1565: 1560: 1556: 1555: 1552: 1547: 1543: 1542: 1539: 1534: 1530: 1529: 1523: 1522: 1520: 1518: 1514: 1513: 1511: 1509: 1505: 1504: 1501: 1496: 1492: 1491: 1488: 1483: 1479: 1478: 1475: 1470: 1466: 1465: 1462: 1457: 1456:Thh:mm:ss.sss 1450: 1447: 1403: 1402: 1399: 1394: 1387: 1384: 1383: 1382: 1379: 1357: 1356: 1353: 1350: 1347: 1344: 1330:weekday number 1306: 1305: 1302: 1297: 1293: 1292: 1289: 1284: 1274:Main article: 1271: 1268: 1267: 1266: 1210: 1209: 1203: 1202: 1196: 1195: 1192: 1187: 1181: 1180: 1177: 1172: 1166: 1165: 1162: 1157: 1151: 1150: 1144: 1143: 1136: 1130: 1129: 1126: 1121: 1112: 1111:Calendar dates 1109: 1060: 1059: 1051: 1050: 1043: 1040: 1002: 1001: 998: 995: 992: 989: 986: 983: 980: 974: 973: 970: 967: 964: 961: 958: 955: 952: 946: 945: 942: 939: 936: 933: 930: 927: 924: 918: 917: 914: 911: 908: 905: 902: 899: 896: 890: 889: 886: 883: 880: 877: 874: 871: 868: 862: 861: 858: 855: 852: 849: 846: 843: 840: 834: 833: 830: 827: 824: 821: 818: 815: 812: 802: 799: 798: 797: 790: 783: 756: 749: 736: 733: 730: 729: 726: 722: 721: 718: 714: 713: 710: 706: 705: 702: 698: 697: 694: 690: 689: 686: 682: 681: 678: 674: 673: 670: 586: 583: 581:the standard. 559:names of years 554:time intervals 497: 496: 495:2024‐263 493: 487: 486: 483: 479: 478: 475: 469: 468: 450: 446: 445: 440: 433: 432: 427: 420: 419: 416: 403: 402: 400: 399: 392: 385: 377: 374: 373: 370: 369: 364: 359: 354: 348: 345:Related topics 344: 343: 342: 339: 338: 335: 334: 329: 322: 317: 312: 307: 301: 297: 296: 291: 287: 286: 285: 284: 281: 280: 277: 276: 271: 266: 260: 256: 255: 250: 244: 243: 242: 241: 238: 237: 234: 233: 228: 223: 218: 213: 208: 203: 197: 193: 192: 189: 183: 182: 181: 180: 177: 176: 173: 172: 167: 162: 157: 151: 145: 144: 143: 140: 139: 136: 135: 130: 125: 120: 115: 110: 105: 99: 95: 94: 93: 90: 89: 86: 85: 84: 83: 72: 71: 66: 61: 55: 52:Major concepts 51: 50: 49: 46: 45: 37: 36: 26: 24: 14: 13: 10: 9: 6: 4: 3: 2: 7991: 7980: 7977: 7975: 7972: 7970: 7969:ISO standards 7967: 7965: 7962: 7960: 7957: 7956: 7954: 7939: 7931: 7930: 7927: 7921: 7918: 7916: 7913: 7911: 7908: 7906: 7903: 7901: 7898: 7896: 7893: 7891: 7888: 7886: 7883: 7881: 7878: 7876: 7873: 7871: 7868: 7866: 7863: 7861: 7858: 7857: 7855: 7851: 7845: 7842: 7840: 7837: 7835: 7832: 7829: 7827: 7824: 7822: 7819: 7817: 7814: 7812: 7809: 7807: 7804: 7802: 7799: 7797: 7794: 7792: 7789: 7787: 7784: 7782: 7779: 7777: 7774: 7772: 7769: 7767: 7764: 7762: 7759: 7757: 7754: 7752: 7749: 7747: 7744: 7742: 7739: 7737: 7734: 7732: 7729: 7727: 7724: 7722: 7719: 7717: 7714: 7712: 7709: 7707: 7704: 7702: 7699: 7697: 7694: 7692: 7689: 7687: 7684: 7682: 7679: 7677: 7674: 7672: 7669: 7667: 7664: 7662: 7659: 7657: 7654: 7652: 7649: 7647: 7644: 7642: 7639: 7637: 7634: 7632: 7629: 7627: 7624: 7622: 7619: 7617: 7614: 7612: 7609: 7607: 7604: 7602: 7599: 7597: 7594: 7592: 7589: 7587: 7584: 7583: 7581: 7577: 7571: 7568: 7566: 7563: 7561: 7558: 7556: 7553: 7551: 7548: 7546: 7543: 7541: 7538: 7536: 7533: 7531: 7528: 7526: 7523: 7521: 7518: 7516: 7513: 7511: 7508: 7506: 7503: 7501: 7498: 7496: 7493: 7491: 7488: 7486: 7483: 7481: 7478: 7476: 7473: 7471: 7468: 7466: 7463: 7461: 7458: 7454: 7451: 7449: 7446: 7445: 7444: 7441: 7439: 7436: 7434: 7431: 7429: 7426: 7424: 7421: 7419: 7416: 7414: 7411: 7409: 7406: 7404: 7401: 7399: 7396: 7394: 7391: 7389: 7386: 7384: 7381: 7379: 7376: 7374: 7371: 7369: 7366: 7364: 7361: 7359: 7356: 7354: 7351: 7349: 7346: 7344: 7341: 7339: 7336: 7334: 7331: 7329: 7326: 7324: 7321: 7319: 7316: 7314: 7311: 7309: 7306: 7304: 7301: 7299: 7296: 7294: 7291: 7289: 7286: 7282: 7279: 7278: 7277: 7274: 7272: 7269: 7267: 7264: 7262: 7259: 7257: 7254: 7252: 7249: 7247: 7244: 7240: 7237: 7235: 7232: 7231: 7230: 7227: 7225: 7222: 7220: 7217: 7215: 7212: 7210: 7207: 7205: 7202: 7200: 7197: 7195: 7192: 7190: 7187: 7185: 7182: 7180: 7177: 7175: 7172: 7170: 7167: 7165: 7162: 7160: 7157: 7153: 7150: 7148: 7145: 7143: 7140: 7138: 7135: 7133: 7130: 7128: 7125: 7123: 7120: 7118: 7115: 7113: 7110: 7109: 7108: 7105: 7103: 7100: 7098: 7095: 7093: 7090: 7088: 7085: 7083: 7080: 7078: 7075: 7073: 7070: 7068: 7065: 7063: 7060: 7058: 7055: 7053: 7050: 7048: 7045: 7043: 7040: 7038: 7035: 7033: 7030: 7028: 7025: 7023: 7020: 7018: 7015: 7013: 7010: 7006: 7003: 7001: 6998: 6997: 6996: 6993: 6991: 6988: 6986: 6983: 6981: 6978: 6976: 6973: 6971: 6968: 6966: 6963: 6961: 6958: 6956: 6953: 6951: 6948: 6945: 6941: 6938: 6936: 6933: 6931: 6928: 6926: 6923: 6921: 6918: 6916: 6913: 6911: 6908: 6906: 6903: 6901: 6898: 6896: 6893: 6891: 6888: 6886: 6883: 6881: 6878: 6876: 6873: 6871: 6868: 6866: 6863: 6861: 6858: 6856: 6853: 6851: 6848: 6846: 6843: 6841: 6838: 6836: 6833: 6831: 6828: 6826: 6823: 6819: 6816: 6814: 6811: 6809: 6806: 6804: 6801: 6799: 6796: 6795: 6794: 6791: 6789: 6786: 6784: 6781: 6779: 6776: 6774: 6771: 6769: 6766: 6764: 6761: 6759: 6756: 6754: 6751: 6749: 6746: 6744: 6741: 6739: 6736: 6735: 6733: 6729: 6723: 6720: 6718: 6715: 6713: 6710: 6708: 6705: 6703: 6700: 6698: 6695: 6693: 6690: 6688: 6685: 6683: 6680: 6678: 6675: 6673: 6670: 6668: 6665: 6663: 6660: 6658: 6655: 6653: 6650: 6648: 6645: 6643: 6640: 6638: 6635: 6633: 6630: 6628: 6625: 6623: 6620: 6618: 6615: 6613: 6610: 6608: 6605: 6603: 6600: 6598: 6595: 6591: 6588: 6586: 6583: 6581: 6578: 6576: 6573: 6571: 6568: 6566: 6563: 6561: 6558: 6556: 6553: 6551: 6548: 6546: 6543: 6541: 6538: 6536: 6533: 6531: 6528: 6526: 6523: 6521: 6518: 6516: 6513: 6511: 6508: 6507: 6506: 6503: 6501: 6498: 6496: 6493: 6491: 6488: 6486: 6483: 6481: 6478: 6476: 6473: 6471: 6468: 6466: 6463: 6461: 6458: 6456: 6453: 6451: 6448: 6446: 6443: 6441: 6438: 6436: 6433: 6431: 6428: 6426: 6423: 6421: 6418: 6416: 6413: 6411: 6408: 6406: 6403: 6401: 6398: 6396: 6393: 6391: 6388: 6386: 6383: 6381: 6378: 6374: 6371: 6370: 6369: 6366: 6364: 6361: 6359: 6356: 6354: 6351: 6349: 6346: 6344: 6341: 6339: 6336: 6334: 6331: 6329: 6326: 6324: 6321: 6319: 6316: 6314: 6311: 6309: 6306: 6304: 6301: 6299: 6296: 6294: 6291: 6289: 6286: 6284: 6281: 6279: 6276: 6274: 6271: 6269: 6266: 6264: 6261: 6259: 6256: 6254: 6251: 6249: 6246: 6244: 6241: 6239: 6236: 6234: 6231: 6229: 6226: 6224: 6221: 6219: 6216: 6214: 6211: 6209: 6206: 6204: 6201: 6199: 6196: 6194: 6191: 6189: 6186: 6184: 6181: 6179: 6176: 6174: 6171: 6169: 6166: 6164: 6161: 6159: 6156: 6152: 6149: 6147: 6144: 6142: 6139: 6138: 6137: 6134: 6132: 6129: 6127: 6124: 6122: 6119: 6117: 6114: 6112: 6109: 6107: 6104: 6102: 6099: 6097: 6094: 6092: 6089: 6087: 6084: 6082: 6079: 6077: 6074: 6072: 6069: 6067: 6064: 6062: 6059: 6057: 6054: 6052: 6049: 6047: 6044: 6042: 6039: 6037: 6034: 6032: 6029: 6027: 6024: 6022: 6019: 6017: 6014: 6012: 6009: 6007: 6004: 6002: 5999: 5997: 5994: 5992: 5989: 5987: 5984: 5982: 5979: 5977: 5974: 5972: 5969: 5967: 5964: 5962: 5959: 5957: 5954: 5952: 5949: 5947: 5944: 5942: 5939: 5937: 5934: 5932: 5929: 5927: 5924: 5922: 5919: 5917: 5914: 5910: 5907: 5905: 5902: 5900: 5897: 5895: 5892: 5890: 5887: 5886: 5885: 5882: 5880: 5877: 5875: 5872: 5870: 5867: 5865: 5862: 5860: 5857: 5855: 5852: 5850: 5847: 5845: 5842: 5840: 5837: 5835: 5832: 5830: 5827: 5825: 5822: 5820: 5817: 5815: 5812: 5810: 5807: 5805: 5802: 5798: 5795: 5793: 5790: 5788: 5785: 5783: 5780: 5778: 5775: 5773: 5770: 5768: 5765: 5763: 5760: 5758: 5755: 5753: 5750: 5748: 5745: 5743: 5740: 5738: 5735: 5734: 5733: 5730: 5728: 5725: 5723: 5720: 5718: 5715: 5713: 5710: 5708: 5705: 5703: 5700: 5698: 5695: 5693: 5690: 5688: 5685: 5684: 5682: 5678: 5674: 5673:IEC standards 5670: 5666: 5665:ISO standards 5660: 5652: 5645: 5640: 5638: 5633: 5631: 5626: 5625: 5622: 5610: 5607: 5605: 5602: 5600: 5597: 5595: 5592: 5590: 5587: 5585: 5582: 5580: 5577: 5573: 5570: 5569: 5568: 5565: 5563: 5560: 5559: 5557: 5553: 5547: 5544: 5542: 5539: 5537: 5534: 5532: 5529: 5527: 5524: 5522: 5519: 5517: 5514: 5512: 5509: 5507: 5504: 5502: 5499: 5497: 5494: 5492: 5489: 5487: 5484: 5482: 5479: 5477: 5474: 5472: 5469: 5467: 5464: 5462: 5459: 5457: 5454: 5453: 5451: 5449: 5448:units of time 5444: 5438: 5437:Sidereal time 5435: 5433: 5430: 5428: 5425: 5423: 5422:Galactic year 5420: 5419: 5417: 5415: 5411: 5405: 5402: 5400: 5397: 5395: 5392: 5391: 5389: 5385: 5379: 5378:Weekday names 5376: 5374: 5371: 5369: 5368:Tropical year 5366: 5364: 5361: 5359: 5356: 5354: 5351: 5349: 5346: 5344: 5341: 5339: 5336: 5334: 5333:Intercalation 5331: 5329: 5326: 5324: 5321: 5319: 5316: 5314: 5311: 5309: 5306: 5304: 5301: 5299:(lunar Hijri) 5298: 5295: 5293: 5290: 5288: 5285: 5283: 5280: 5278: 5275: 5274: 5272: 5270: 5266: 5260: 5257: 5255: 5252: 5250: 5247: 5245: 5242: 5240: 5237: 5235: 5232: 5228: 5225: 5224: 5223: 5220: 5218: 5215: 5213: 5210: 5208: 5205: 5203: 5200: 5198: 5195: 5193: 5190: 5188: 5185: 5183: 5180: 5178: 5175: 5174: 5172: 5170: 5166: 5160: 5157: 5155: 5152: 5150: 5147: 5145: 5142: 5140: 5139:Time dilation 5137: 5135: 5132: 5130: 5127: 5125: 5122: 5120: 5117: 5115: 5112: 5110: 5107: 5105: 5102: 5100: 5097: 5095: 5092: 5091: 5089: 5087: 5083: 5077: 5074: 5072: 5069: 5067: 5064: 5063: 5061: 5057: 5052: 5046: 5036: 5033: 5031: 5028: 5026: 5023: 5021: 5018: 5016: 5013: 5011: 5008: 5006: 5003: 5001: 4998: 4996: 4993: 4991: 4988: 4986: 4983: 4981: 4978: 4976: 4975:24-hour clock 4973: 4971: 4970:12-hour clock 4968: 4966: 4963: 4961: 4958: 4956: 4953: 4951: 4948: 4946: 4943: 4941: 4938: 4936: 4933: 4929: 4926: 4925: 4924: 4921: 4920: 4918: 4914: 4908: 4905: 4903: 4900: 4898: 4895: 4894: 4891: 4887: 4883: 4876: 4871: 4869: 4864: 4862: 4857: 4856: 4853: 4847: 4844: 4843: 4842: 4841: 4834: 4830: 4827: 4824: 4821: 4819: 4815: 4812: 4809: 4805: 4802: 4800: 4796: 4793: 4790: 4787: 4785: 4782: 4780: 4777: 4774: 4771: 4768: 4765: 4763: 4760: 4759: 4755: 4740: 4736: 4730: 4727: 4715: 4711: 4710:SABS Webstore 4707: 4701: 4698: 4687: 4680: 4673: 4670: 4658: 4654: 4648: 4645: 4633: 4627: 4624: 4611: 4607: 4603: 4596: 4593: 4582: 4579: 4574: 4569: 4565: 4561: 4560: 4552: 4549: 4544: 4541: 4536: 4531: 4527: 4523: 4522: 4517: 4511: 4508: 4497: 4494: 4489: 4484: 4480: 4476: 4475: 4470: 4463: 4460: 4449: 4446: 4441: 4436: 4432: 4428: 4427: 4419: 4416: 4405:on 2015-03-09 4404: 4400: 4393: 4390: 4387: 4383: 4380: 4375: 4372: 4360: 4356: 4350: 4347: 4335: 4332:. Cs.tut.fi. 4331: 4325: 4322: 4310: 4306: 4302: 4296: 4293: 4281: 4277: 4273: 4267: 4264: 4258: 4255: 4251: 4237: 4233: 4226: 4220: 4217: 4213: 4208: 4203: 4199: 4195: 4191: 4187: 4180: 4177: 4173: 4168: 4164: 4158: 4155: 4151: 4143: 4139: 4132: 4131: 4123: 4120: 4116: 4112:Tools Pages. 4111: 4099: 4095: 4091: 4087: 4083: 4079: 4075: 4074: 4066: 4063: 4057: 4054: 4048: 4045: 4040: 4034: 4030: 4026: 4022: 4016: 4013: 3998: 3994: 3987: 3981: 3978: 3966: 3962: 3955: 3952: 3940: 3936: 3935: 3930: 3926: 3920: 3917: 3913: 3909: 3905: 3899: 3896: 3890: 3887: 3881: 3878: 3874: 3863: 3859: 3855: 3851: 3850: 3845: 3838: 3835: 3830: 3819: 3815: 3811: 3807: 3803: 3795: 3792: 3786: 3783: 3777: 3774: 3770: 3765: 3761: 3755: 3752: 3747: 3743: 3737: 3734: 3730: 3726: 3722: 3720:0-935702-68-7 3716: 3712: 3711: 3703: 3700: 3696: 3692: 3686: 3683: 3677: 3674: 3661: 3657: 3656: 3651: 3644: 3641: 3637: 3633: 3629: 3623: 3621: 3617: 3605: 3601: 3599: 3591: 3588: 3580: 3576: 3575: 3567: 3561: 3558: 3550: 3546: 3545: 3537: 3531: 3528: 3517:on 2017-07-15 3516: 3512: 3508: 3502: 3499: 3487: 3483: 3479: 3473: 3470: 3458: 3454: 3450: 3444: 3442: 3438: 3426: 3422: 3420: 3412: 3409: 3401: 3397: 3396: 3388: 3382: 3379: 3374: 3370: 3364: 3361: 3349: 3345: 3339: 3336: 3331: 3327: 3321: 3318: 3314: 3309: 3305: 3299: 3297: 3293: 3287: 3285: 3281: 3276: 3272: 3266: 3264: 3262: 3258: 3251: 3247: 3243: 3240: 3238: 3235: 3233: 3230: 3228: 3225: 3223: 3220: 3219: 3215: 3209: 3206: 3203: 3202: 3198: 3195: 3194: 3190: 3187: 3186: 3182: 3179: 3178: 3174: 3173:TS ISO 8601-2 3170: 3169:TS ISO 8601-1 3167: 3165: 3162: 3161: 3157: 3154: 3153: 3149: 3146: 3145: 3141: 3138: 3137: 3133: 3130: 3129: 3125: 3122: 3121: 3117: 3115:South Africa 3114: 3113: 3109: 3106: 3105: 3101: 3098: 3097: 3093: 3090: 3089: 3085: 3082: 3081: 3077: 3074: 3073: 3069: 3066: 3065: 3061: 3058: 3057: 3054:ITM-EN 28601 3053: 3050: 3049: 3045: 3042: 3041: 3037: 3034: 3033: 3029: 3026: 3025: 3021: 3018: 3017: 3013: 3010: 3009: 3006:IS 7900:2001 3005: 3003: 3000: 2999: 2995: 2992: 2991: 2987: 2984: 2983: 2979: 2976: 2975: 2971: 2968: 2967: 2963: 2960: 2959: 2956:SFS-EN 28601 2955: 2952: 2951: 2947: 2945: 2944:European Norm 2942: 2941: 2937: 2934: 2933: 2929: 2926: 2925: 2921: 2918: 2917: 2913: 2910: 2909: 2906: 2902: 2899: 2895: 2892: 2891: 2887: 2884: 2883: 2879: 2876: 2875: 2871: 2868: 2867: 2863: 2860: 2859: 2855: 2852: 2851: 2845: 2843: 2838: 2835: 2830: 2828: 2822: 2820: 2816: 2812: 2804: 2802: 2799: 2798:ISO week date 2791: 2789: 2787: 2783: 2779: 2775: 2770: 2767: 2763: 2759: 2751: 2746: 2742: 2739: 2738: 2734: 2729: 2726: 2723: 2720: 2717: 2714: 2713: 2711: 2708: 2707: 2706: 2700: 2698: 2679: 2676: 2673: 2672: 2665: 2662: 2659: 2658: 2654: 2651: 2648: 2645: 2642: 2641: 2634: 2631: 2628: 2627: 2623: 2620: 2617: 2614: 2611: 2610: 2606: 2603: 2600: 2597: 2594: 2593: 2586: 2583: 2580: 2579: 2575: 2572: 2569: 2566: 2563: 2562: 2558: 2555: 2552: 2551: 2544: 2541: 2538: 2537: 2533: 2530: 2527: 2524: 2521: 2520: 2513: 2510: 2507: 2506: 2502: 2499: 2496: 2493: 2490: 2489: 2485: 2482: 2479: 2476: 2473: 2472: 2468: 2465: 2463:Basic example 2462: 2459: 2456: 2455: 2449: 2443: 2435: 2433: 2421: 2418: 2408: 2407: 2403: 2402: 2396: 2394: 2371: 2367: 2365: 2361: 2357: 2356:forward slash 2353: 2345: 2342: 2339: 2336: 2335: 2334: 2331: 2322: 2321: 2317: 2316: 2312: 2311: 2307: 2306: 2300: 2298: 2292: 2289: 2288: 2287: 2285: 2279: 2277: 2263: 2261: 2257: 2253: 2247: 2243: 2235: 2232: 2229: 2226: 2223: 2220: 2219: 2217: 2214: 2209: 2206: 2203: 2200: 2197: 2194: 2191: 2188: 2187: 2185: 2181: 2178: 2177: 2176: 2174: 2170: 2166: 2162: 2158: 2154: 2150: 2146: 2142: 2131: 2130: 2126: 2125: 2121: 2120: 2114: 2112: 2108: 2097: 2091: 2083: 2073: 2072: 2066: 2064: 2061: 2051: 2047: 2026: 2018: 2014: 2005: 2003: 1998: 1996: 1983: 1981: 1979: 1975: 1968: 1964: 1960: 1958: 1954: 1950: 1948: 1944: 1940: 1938: 1934: 1930: 1926: 1924: 1920: 1916: 1914: 1910: 1906: 1905:standard time 1902: 1898: 1894: 1892: 1888: 1884: 1883: 1879: 1877: 1875: 1871: 1867: 1863: 1862:standard time 1859: 1854: 1852: 1848: 1844: 1843:standard time 1840: 1836: 1832: 1827: 1825: 1821: 1817: 1813: 1812:nautical time 1809: 1801: 1799: 1797: 1793: 1789: 1785: 1780: 1778: 1774: 1770: 1762: 1760: 1758: 1753: 1745: 1743: 1741: 1737: 1728: 1727: 1723: 1722: 1718: 1717: 1713: 1712: 1706: 1704: 1702: 1696: 1694: 1690: 1686: 1682: 1678: 1673: 1670: 1669: 1660: 1657: 1653: 1649: 1648: 1647: 1644: 1642: 1638: 1630: 1626: 1622: 1619: 1615: 1612: 1608: 1607: 1606: 1604: 1601:is T and the 1600: 1596: 1595:24-hour clock 1585: 1579: 1576: 1574: 1571: 1570: 1566: 1564: 1561: 1558: 1557: 1553: 1551: 1548: 1545: 1544: 1540: 1538: 1535: 1533:hh:mm:ss.sss 1532: 1531: 1528: 1524: 1521: 1519: 1516: 1515: 1512: 1510: 1507: 1506: 1502: 1500: 1497: 1494: 1493: 1489: 1487: 1484: 1481: 1480: 1476: 1474: 1471: 1468: 1467: 1463: 1461: 1458: 1455: 1454: 1448: 1446: 1436: 1430: 1420: 1416: 1412: 1411: 1400: 1398: 1395: 1392: 1391: 1386:Ordinal dates 1385: 1380: 1377: 1376: 1375: 1372: 1369: 1364: 1361: 1354: 1351: 1348: 1345: 1342: 1338: 1337: 1336: 1333: 1331: 1327: 1323: 1322: 1317: 1313: 1303: 1301: 1298: 1295: 1294: 1290: 1288: 1285: 1282: 1281: 1277: 1276:ISO week date 1269: 1264: 1263: 1262: 1259: 1253: 1241: 1237: 1228: 1226: 1222: 1205: 1204: 1198: 1197: 1193: 1191: 1188: 1183: 1182: 1178: 1176: 1173: 1168: 1167: 1163: 1161: 1158: 1153: 1152: 1149: 1145: 1141: 1132: 1131: 1127: 1125: 1122: 1117: 1116: 1110: 1108: 1106: 1102: 1098: 1094: 1090: 1085: 1083: 1079: 1076:, similar to 1075: 1071: 1067: 1057: 1053: 1052: 1048: 1047: 1041: 1039: 1037: 1033: 1028: 1026: 1022: 1017: 1011: 1009: 975: 947: 919: 891: 863: 835: 809: 800: 795: 791: 788: 784: 777: 773: 769: 765: 761: 757: 754: 753:leading zeros 750: 747: 743: 739: 738: 734: 727: 724: 723: 719: 716: 715: 711: 708: 707: 703: 701:ISO 8601:2004 700: 699: 695: 693:ISO 8601:2000 692: 691: 687: 684: 683: 679: 677:ISO 8601:1988 676: 675: 671: 668: 667: 661: 659: 653: 651: 645: 639: 634: 632: 628: 624: 620: 616: 612: 608: 604: 600: 596: 592: 584: 582: 579: 575: 570: 568: 564: 560: 556: 555: 550: 546: 542: 538: 534: 530: 525: 523: 519: 515: 511: 507: 503: 494: 492: 488: 484: 480: 476: 474: 470: 467: 463: 461: 455: 451: 447: 441: 439: 434: 428: 426: 421: 417: 413: 398: 393: 391: 386: 384: 379: 378: 376: 375: 368: 365: 363: 360: 358: 355: 353: 350: 349: 341: 340: 333: 330: 328: 323: 321: 318: 316: 313: 311: 308: 306: 305:Chronobiology 303: 302: 295: 292: 289: 288: 283: 282: 275: 272: 270: 267: 265: 262: 261: 254: 251: 249: 246: 245: 240: 239: 232: 229: 227: 226:Reincarnation 224: 222: 219: 217: 214: 212: 209: 207: 204: 202: 199: 198: 190: 188: 185: 184: 179: 178: 171: 168: 166: 163: 161: 158: 156: 153: 152: 148: 142: 141: 134: 131: 129: 126: 124: 121: 119: 116: 114: 111: 109: 106: 104: 101: 100: 92: 91: 82: 79: 78: 77: 74: 73: 70: 67: 65: 62: 60: 57: 56: 48: 47: 43: 39: 38: 35: 31: 19: 7791:27000 series 6459: 5584:Decimal time 5313:Astronomical 5192:Complication 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