45:
34:
221:
Timestamps are often found to be dirty in many cases. Without cleaning up inaccurate timestamps, time-related applications such as provenance analysis or pattern queries are not reliable. To evaluate the correctness of timestamps, temporal constraints can be applied, declaring distance limits between
67:
is a sequence of characters or encoded information identifying when a certain event occurred, usually giving date and time of day, sometimes accurate to a small fraction of a second. Timestamps do not have to be based on some absolute notion of time, however. They can have any epoch, can be relative
530:
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
218:, when they copy a file from some remote computer to the local computer, adjust the timestamps of the local file to show the date/time in the past when that file was created or modified on that remote computer, rather than the date/time when that file was copied to the local computer.
166:
This data is usually presented in a consistent format, allowing for easy comparison of two different records and tracking progress over time; the practice of recording timestamps in a consistent manner along with the actual data is called
133:
used in offices to stamp the current date, and sometimes time, in ink on paper documents, to record when the document was received. Common examples of this type of timestamp are a
396:
517:
144:
With the advent of digital data systems, the term has expanded to refer to digital date and time information attached to digital data. For example,
215:
447:
411:
233:
standardizes the representation of dates and times. These standard representations are often used to construct timestamp values.
376:
21 (a unitless counter which indicates only the relative order of events; this is event #21, which comes after 20 and before 22)
386:
252:
Thurs 31.12.2009 13:35 (same time as the above, different format with little-endian date and big-endian 24-hour clock)
406:
168:
161:
365:
17 minutes (an arbitrary minute counter which increments every 1 minute since its last manual "reset" event)
416:
68:
to any arbitrary time, such as the power-on time of a system, or to some arbitrary time in the past.
401:
492:
192:
181:
484:
443:
437:
152:
add timestamps to the pictures they take, recording the date and time the picture was taken.
476:
391:
369:
332:
464:
149:
549:
543:
324:
246:
211:
145:
108:
195:, so each file has three timestamps associated with it: time of last access (atime:
496:
310:
177:
130:
54:
531:
representations, i.e. before the start of the year or after the end of the year .
320:
188:
44:
480:
260:
184:(SOE), in which case each event in the log or SOE is marked with a timestamp.
138:
488:
295:
264:
33:
20:
510:
187:
Practically all computer file systems store one or more timestamps in the
348:
288:
281:
230:
134:
95:
463:
Song, Shaoxu; Huang, Ruihong; Cao, Yue; Wang, Jianmin (May 2021).
148:
contain timestamps that tell when the file was last modified, and
191:. In particular, most modern operating systems support the POSIX
336:
271:
256:
397:
Decentralized trusted timestamping on the blockchain
436:Claudia Maria Bauzer Medeiros (19 September 2009).
362:
123478382 ns (the number of nanoseconds since boot)
71:A distinction is sometimes made between the terms
439:ADVANCED GEOGRAPHIC INFORMATION SYSTEMS -Volume I
274:(same format as the above, hence easy to compare)
120:: Date and time, for example 2025-05-25, 16:13:43
465:"Cleaning timestamps with temporal constraints"
94:: A date, for example 2025-05-25 according to
16:Information identifying when an event occurred
249:(mixed-endian date, big-endian 12-hour clock)
137:on a letter or the "in" and "out" times on a
8:
107:: A time of day, for example 16:13:43 using
301:(1969-07-21 T 02:56 UTC) –
287:2009-10-31 01:48:52Z ("internet time" per
203:), and time of last status change (ctime:
428:
298:, equivalent to 2009-10-31 T 01:48:52Z)
359:17:30:23 (time of day in an afternoon)
199:), time of last modification (mtime:
7:
412:Timestamp-based concurrency control
442:. EOLSS Publications. p. 59.
176:Timestamps are typically used for
129:The term "timestamp" derives from
14:
339:, equals 3 February 2018 7:30:00)
43:
32:
19:For Unix (POSIX) timestamp, see
259:(international ISO-time order (
1:
387:Advanced electronic signature
351:representation of 2025 May 25
304:07:38, 11 December 2012 (UTC)
241:Examples of date-timestamps:
566:
481:10.1007/s00778-020-00641-6
159:
18:
407:Timestamping (computing)
355:Examples of timestamps:
343:Examples of datestamps:
331:20180203073000 (Used in
313:102, i.e. 1985 April 12)
277:Sat Jul 23 02:16:57 2005
216:version control software
162:Timestamping (computing)
317:1985-W15-5 T 10:15 UTC
280:2009-10-31T01:48:52Z (
245:Thurs 12/31/2009 1:35
307:1985-102 T 10:15 UTC
417:Trusted timestamping
291:, based on ISO 8601)
402:Linked timestamping
270:2007-11-09 T 11:20
255:2005-10-30 T 10:45
511:"ISO 8601:2004(E)"
327:5 = 1985 April 12)
193:stat (system call)
182:sequence of events
156:Digital timestamps
520:. 1 December 2004
449:978-1-905839-91-9
189:per-file metadata
57:from around 1960.
557:
534:
533:
527:
525:
515:
507:
501:
500:
469:The VLDB Journal
460:
454:
453:
433:
206:
202:
198:
47:
36:
565:
564:
560:
559:
558:
556:
555:
554:
540:
539:
538:
537:
523:
521:
513:
509:
508:
504:
462:
461:
457:
450:
435:
434:
430:
425:
392:Bates numbering
383:
370:Sequence number
333:Wayback Machine
239:
228:
226:Standardization
204:
200:
196:
164:
158:
150:digital cameras
127:
61:
60:
59:
58:
53:An actual time-
50:
49:
48:
39:
38:
37:
24:
17:
12:
11:
5:
563:
561:
553:
552:
542:
541:
536:
535:
502:
475:(3): 425–446.
455:
448:
427:
426:
424:
421:
420:
419:
414:
409:
404:
399:
394:
389:
382:
379:
378:
377:
367:
366:
363:
360:
353:
352:
341:
340:
329:
315:
305:
302:
299:
292:
285:
278:
275:
268:
253:
250:
238:
235:
227:
224:
212:file archivers
178:logging events
160:Main article:
157:
154:
146:computer files
126:
123:
122:
121:
114:Date-timestamp
111:
98:
81:date-timestamp
52:
51:
42:
41:
40:
31:
30:
29:
28:
27:
15:
13:
10:
9:
6:
4:
3:
2:
562:
551:
548:
547:
545:
532:
519:
512:
506:
503:
498:
494:
490:
486:
482:
478:
474:
470:
466:
459:
456:
451:
445:
441:
440:
432:
429:
422:
418:
415:
413:
410:
408:
405:
403:
400:
398:
395:
393:
390:
388:
385:
384:
380:
375:
374:
373:
371:
364:
361:
358:
357:
356:
350:
349:international
346:
345:
344:
338:
334:
330:
328:
326:
322:
316:
314:
312:
306:
303:
300:
297:
293:
290:
286:
283:
279:
276:
273:
269:
266:
262:
258:
254:
251:
248:
244:
243:
242:
236:
234:
232:
225:
223:
219:
217:
213:
208:
194:
190:
185:
183:
179:
174:
172:
171:
163:
155:
153:
151:
147:
142:
140:
136:
132:
131:rubber stamps
124:
119:
115:
112:
110:
109:24-hour clock
106:
102:
99:
97:
93:
89:
86:
85:
84:
82:
78:
74:
69:
66:
56:
46:
35:
26:
22:
529:
522:. Retrieved
505:
472:
468:
458:
438:
431:
368:
354:
347:2025-05-25,
342:
319:(year 1985,
318:
309:(year 1985,
308:
294:1256953732 (
240:
229:
222:timestamps.
220:
209:
186:
175:
170:timestamping
169:
165:
143:
128:
117:
113:
104:
100:
91:
87:
80:
76:
72:
70:
64:
62:
25:
321:week number
423:References
311:day number
261:big-endian
489:1066-8888
296:Unix time
265:time zone
214:and some
139:time card
101:Timestamp
88:Datestamp
77:timestamp
73:datestamp
65:timestamp
21:Unix time
544:Category
381:See also
335:memento
289:RFC 3339
282:ISO 8601
237:Examples
231:ISO 8601
180:or in a
135:postmark
96:ISO 8601
524:7 March
497:7559769
325:weekday
263:) with
125:History
495:
487:
446:
205:ls -lc
197:ls -lu
514:(PDF)
493:S2CID
210:Some
201:ls -l
55:stamp
550:Time
526:2010
485:ISSN
444:ISBN
337:URLs
323:15,
247:p.m.
79:and
518:ISO
477:doi
272:UTC
257:UTC
207:).
118:DTS
116:or
103:or
90:or
546::
528:.
516:.
491:.
483:.
473:30
471:.
467:.
372::
173:.
141:.
105:TS
92:DS
83::
75:,
63:A
499:.
479::
452:.
284:)
267:)
23:.
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
