Unix time - Revision history

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http://fileformats.archiveteam.org/index.php?action=history&feed=atom&title=Unix_time Unix time - Revision history 2024-06-16T03:37:05Z Revision history for this page on the wiki MediaWiki 1.19.2
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http://fileformats.archiveteam.org/index.php?title=Unix_time&diff=28623&oldid=prev Jsummers: Category:Date and time formats 2017-07-23T15:01:08Z

<p>Category:Date and time formats</p> <table class='diff diff-contentalign-left'> <col class='diff-marker' /> <col class='diff-content' /> <col class='diff-marker' /> <col class='diff-content' /> <tr valign='top'> <td colspan='2' style="background-color: white; color:black;">← Older revision</td> <td colspan='2' style="background-color: white; color:black;">Revision as of 15:01, 23 July 2017</td> </tr><tr><td colspan="2" class="diff-lineno">Line 41:</td> <td colspan="2" class="diff-lineno">Line 41:</td></tr> <br /> <b>Warning</b>: require(): Unable to allocate memory for pool. in <b>/usr/local/www/mediawiki/includes/AutoLoader.php</b> on line <b>1007</b><br /> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [http://www.epochconverter.com/ Epoch converter]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [http://www.epochconverter.com/ Epoch converter]</div></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [http://www.iana.org/time-zones Time zone database]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [http://www.iana.org/time-zones Time zone database]</div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;"></ins></div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">[[Category:Date and time formats]]</ins></div></td></tr> </table>

Jsummers http://fileformats.archiveteam.org/index.php?title=Unix_time&diff=28066&oldid=prev Jsummers at 16:15, 28 May 2017 2017-05-28T16:15:29Z

<p></p> <table class='diff diff-contentalign-left'> <col class='diff-marker' /> <col class='diff-content' /> <col class='diff-marker' /> <col class='diff-content' /> <tr valign='top'> <td colspan='2' style="background-color: white; color:black;">← Older revision</td> <td colspan='2' style="background-color: white; color:black;">Revision as of 16:15, 28 May 2017</td> </tr><tr><td colspan="2" class="diff-lineno">Line 3:</td> <td colspan="2" class="diff-lineno">Line 3:</td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|subcat=Elements of File Formats</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|subcat=Elements of File Formats</div></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>}}</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>}}</div></td></tr> <tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;"></del></div></td><td colspan="2"> </td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>'''Unix time''', or POSIX time, is a representation of a date and time in the form of a number representing the number of seconds since the "epoch" of January 1, 1970 at 00:00 (midnight) UTC. "Seconds" for this purpose are reckoned so that a calendar day is always exactly 86,400 seconds, which means that leap seconds are skipped in the numbering.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>'''Unix time''', or POSIX time, is a representation of a date and time in the form of a number representing the number of seconds since the "epoch" of January 1, 1970 at 00:00 (midnight) UTC. "Seconds" for this purpose are reckoned so that a calendar day is always exactly 86,400 seconds, which means that leap seconds are skipped in the numbering.</div></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">== Discussion ==</ins></div></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>Technically speaking, the modern definition of UTC with leap seconds was not in use until 1972, so the actual definition of the epoch time in 1970 is a bit hazy. However, in practice, the standard simply consists of days of a fixed number of seconds extending indefinitely into the past and future (seconds before 1972 were actually variable in length to match the varying length of the solar day), with the behavior of the count at the exact moment of a leap second slightly irregular.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>Technically speaking, the modern definition of UTC with leap seconds was not in use until 1972, so the actual definition of the epoch time in 1970 is a bit hazy. However, in practice, the standard simply consists of days of a fixed number of seconds extending indefinitely into the past and future (seconds before 1972 were actually variable in length to match the varying length of the solar day), with the behavior of the count at the exact moment of a leap second slightly irregular.</div></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td colspan="2" class="diff-lineno">Line 19:</td> <td colspan="2" class="diff-lineno">Line 19:</td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>If fractional seconds are needed, the number of bits required and the time of overflow will vary. Milliseconds (1/1000 sec) are often used, adding three decimal digits to the representations.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>If fractional seconds are needed, the number of bits required and the time of overflow will vary. Milliseconds (1/1000 sec) are often used, adding three decimal digits to the representations.</div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;"></ins></div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">== Examples ==</ins></div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">Using the Unix (GNU) <code>date</code> command...</ins></div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;"></ins></div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">Show current time as a Unix time:</ins></div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;"> $ date +'%s'</ins></div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;"></ins></div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">Decode a Unix time to a readable time:</ins></div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;"> $ date -u --date='@1234567890' -R</ins></div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;"> Fri, 13 Feb 2009 23:31:30 +0000</ins></div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;"></ins></div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">Encode a readable time as a Unix time:</ins></div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;"> $ date -u --date='13 Feb 2009 23:31:30' '+%s'</ins></div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;"> 1234567890</ins></div></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== See also ==</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== See also ==</div></td></tr> <tr><td colspan="2" class="diff-lineno">Line 27:</td> <td colspan="2" class="diff-lineno">Line 41:</td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [http://www.epochconverter.com/ Epoch converter]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [http://www.epochconverter.com/ Epoch converter]</div></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [http://www.iana.org/time-zones Time zone database]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [http://www.iana.org/time-zones Time zone database]</div></td></tr> <tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;"></del></div></td><td colspan="2"> </td></tr> <tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">[[Category:File format details]]</del></div></td><td colspan="2"> </td></tr> <tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">[[Category:Binary Data]]</del></div></td><td colspan="2"> </td></tr> </table>

Jsummers http://fileformats.archiveteam.org/index.php?title=Unix_time&diff=23920&oldid=prev Jsummers: Changed primary category 2015-12-04T19:00:50Z

<p>Changed primary category</p> <table class='diff diff-contentalign-left'> <col class='diff-marker' /> <col class='diff-content' /> <col class='diff-marker' /> <col class='diff-content' /> <tr valign='top'> <td colspan='2' style="background-color: white; color:black;">← Older revision</td> <td colspan='2' style="background-color: white; color:black;">Revision as of 19:00, 4 December 2015</td> </tr><tr><td colspan="2" class="diff-lineno">Line 1:</td> <td colspan="2" class="diff-lineno">Line 1:</td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>{{FormatInfo</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>{{FormatInfo</div></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|formattype=electronic</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|formattype=electronic</div></td></tr> <tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>|subcat=<del class="diffchange diffchange-inline">Binary Data</del></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>|subcat=<ins class="diffchange diffchange-inline">Elements of File Formats</ins></div></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>}}</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>}}</div></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td colspan="2" class="diff-lineno">Line 29:</td> <td colspan="2" class="diff-lineno">Line 29:</td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[Category:File format details]]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[Category:File format details]]</div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">[[Category:Binary Data]]</ins></div></td></tr> </table>

Jsummers http://fileformats.archiveteam.org/index.php?title=Unix_time&diff=15882&oldid=prev Dan Tobias: /* References */ 2014-01-22T14:07:09Z

<p>‎<span dir="auto"><span class="autocomment">References</span></span></p> <table class='diff diff-contentalign-left'> <col class='diff-marker' /> <col class='diff-content' /> <col class='diff-marker' /> <col class='diff-content' /> <tr valign='top'> <td colspan='2' style="background-color: white; color:black;">← Older revision</td> <td colspan='2' style="background-color: white; color:black;">Revision as of 14:07, 22 January 2014</td> </tr><tr><td colspan="2" class="diff-lineno">Line 26:</td> <td colspan="2" class="diff-lineno">Line 26:</td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [[Wikipedia:Unix time|Wikipedia article]]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [[Wikipedia:Unix time|Wikipedia article]]</div></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [http://www.epochconverter.com/ Epoch converter]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [http://www.epochconverter.com/ Epoch converter]</div></td></tr> <tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">* [http://www.iana.org/time-zones Time zone database]</ins></div></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[Category:File format details]]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[Category:File format details]]</div></td></tr> </table>

Dan Tobias http://fileformats.archiveteam.org/index.php?title=Unix_time&diff=8827&oldid=prev Dan Tobias at 17:04, 13 January 2013 2013-01-13T17:04:41Z

Dan Tobias http://fileformats.archiveteam.org/index.php?title=Unix_time&diff=8826&oldid=prev Dan Tobias at 16:39, 13 January 2013 2013-01-13T16:39:50Z

Dan Tobias http://fileformats.archiveteam.org/index.php?title=Unix_time&diff=8825&oldid=prev Dan Tobias: Created page with "{{FormatInfo |formattype=electronic |subcat=Binary Data }} '''Unix time''', or POSIX time, is a representation of a date and time in the form of a number representing the num..." 2013-01-13T16:35:22Z

<p>Created page with "{{FormatInfo |formattype=electronic |subcat=Binary Data }} '''Unix time''', or POSIX time, is a representation of a date and time in the form of a number representing the num..."</p> <p><b>New page</b></p><div>{{FormatInfo<br /> |formattype=electronic<br /> |subcat=Binary Data<br /> }}<br /> <br /> '''Unix time''', or POSIX time, is a representation of a date and time in the form of a number representing the number of seconds since the "epoch" of January 1, 1970 at 00:00 (midnight) UTC. "Seconds" for this purpose are reckoned so that a calendar day is always exactly 86,400 seconds, which means that leap seconds are skipped in the numbering.<br /> <br /> Technically speaking, the modern definition of UTC with leap seconds was not in use until 1972, so the actual definition of the epoch time in 1970 is a bit hazy. However, in practice, the standard simply consists of days of a fixed number of seconds extending indefinitely into the past and future (seconds before 1972 were actually variable in length to match the varying length of the solar day), with the behavior of the count at the exact moment of a leap second slightly irregular.<br /> <br /> Many file formats contain timestamps of this form, stored either as a binary-encoded number to some degree of precision, or as [[ASCII]] strings of digits. When stored as binary, the [[endianness]] of the representation is an issue for the file format.<br /> <br /> When stored as a signed 32-bit integer, Unix timestamps will overflow at 03:14:08 UTC on 19 January 2038. This may be a software problem similar to the much-hyped "Y2K" problem that occurred when the year 2000 was reached and software using 2-digit years had problems as a result.<br /> <br /> Switching to unsigned integers would extend the useful life of the format through 06:28:15 UTC on Sun, 7 February 2106, at the expense of removing the ability to represent times before the epoch with negative numbers.<br /> <br /> The more robust solution would be to adopt 64-bit integers, which would support times through the year 292,277,026,596.<br /> <br /> If fractional seconds are needed, the number of bits required and the time of overflow will vary. Milliseconds (1/1000 sec) are often used, adding three decimal digits to the representations.<br /> <br /> == See also ==<br /> * [[Date and time formats]]<br /> <br /> == References ==<br /> * [[Wikipedia:Unix time|Wikipedia article]]<br /> * [http://www.epochconverter.com/ Epoch converter]</div>

Dan Tobias
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