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Add an appendix with more details on date/time attributes and handling. Update most references to Postgres version numbers to 6.5, *except* for the porting list which will require a report from a successful installation to be updated.
723 lines
19 KiB
Plaintext
723 lines
19 KiB
Plaintext
<!--
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$Header: /cvsroot/pgsql/doc/src/sgml/datetime.sgml,v 2.3 1999/05/26 17:30:28 thomas Exp $
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Date/time details
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$Log: datetime.sgml,v $
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Revision 2.3 1999/05/26 17:30:28 thomas
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Add chapters on CVS access, MVCC, SQL theory to the docs.
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Add an appendix with more details on date/time attributes and handling.
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Update most references to Postgres version numbers to 6.5,
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*except* for the porting list which will require a report
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from a successful installation to be updated.
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Revision 2.2 1999/05/22 02:27:23 thomas
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Finish initial markup of cvs.sgml, and include it in the programmer's guide
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and the integrated doc. Clean up other markup.
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-->
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<appendix label="UG1" id="datetime-appendix">
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<title id="datetime-appendix-title">Date/Time Support</title>
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<sect1>
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<title>Time Zones</title>
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<para>
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<table tocentry="1">
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<title><productname>Postgres</productname> Recognized Time Zones</title>
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<titleabbrev>Time Zones</titleabbrev>
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<tgroup cols="3">
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<thead>
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<row>
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<entry>Time Zone</entry>
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<entry>Offset from UTC</entry>
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<entry>Description</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry>NZDT</entry>
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<entry>+13:00</entry>
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<entry>New Zealand Daylight Time</entry>
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</row>
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<row>
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<entry>IDLE</entry>
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<entry>+12:00</entry>
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<entry>International Date Line, East</entry>
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</row>
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<row>
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<entry>NZST</entry>
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<entry>+12:00</entry>
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<entry>New Zealand Std Time</entry>
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</row>
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<row>
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<entry>NZT</entry>
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<entry>+12:00</entry>
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<entry>New Zealand Time</entry>
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</row>
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<row>
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<entry>AESST</entry>
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<entry>+11:00 </entry>
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<entry>Australia Eastern Summer Std Time</entry>
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</row>
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<row>
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<entry>ACSST</entry>
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<entry>+10:30 </entry>
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<entry>Central Australia Summer Std Time</entry>
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</row>
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<row>
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<entry>CADT</entry>
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<entry>+10:30 </entry>
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<entry>Central Australia Daylight Savings Time</entry>
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</row>
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<row>
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<entry>SADT</entry>
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<entry>+10:30</entry>
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<entry>South Australian Daylight Time</entry>
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</row>
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<row>
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<entry>AEST</entry>
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<entry>+10:00 </entry>
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<entry>Australia Eastern Std Time</entry>
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</row>
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<row>
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<entry>EAST</entry>
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<entry>+10:00 </entry>
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<entry>East Australian Std Time</entry>
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</row>
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<row>
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<entry>GST</entry>
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<entry>+10:00</entry>
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<entry>Guam Std Time, USSR Zone 9</entry>
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</row>
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<row>
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<entry>LIGT</entry>
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<entry>+10:00</entry>
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<entry>Melbourne, Australia</entry>
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</row>
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<row>
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<entry>ACST</entry>
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<entry>+09:30 </entry>
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<entry>Central Australia Std Time</entry>
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</row>
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<row>
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<entry>CAST</entry>
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<entry>+09:30 </entry>
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<entry>Central Australia Std Time</entry>
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</row>
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<row>
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<entry>SAT</entry>
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<entry>+9:30</entry>
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<entry>South Australian Std Time</entry>
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</row>
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<row>
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<entry>AWSST</entry>
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<entry>+9:00 </entry>
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<entry>Australia Western Summer Std Time</entry>
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</row>
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<row>
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<entry>JST</entry>
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<entry>+9:00</entry>
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<entry>Japan Std Time,USSR Zone 8</entry>
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</row>
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<row>
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<entry>KST</entry>
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<entry>+9:00</entry>
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<entry>Korea Standard Time</entry>
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</row>
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<row>
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<entry>WDT</entry>
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<entry>+9:00</entry>
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<entry>West Australian Daylight Time</entry>
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</row>
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<row>
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<entry>MT</entry>
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<entry>+8:30</entry>
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<entry>Moluccas Time</entry>
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</row>
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<row>
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<entry>AWST</entry>
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<entry>+8:00 </entry>
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<entry>Australia Western Std Time</entry>
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</row>
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<row>
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<entry>CCT</entry>
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<entry>+8:00 </entry>
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<entry>China Coastal Time</entry>
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</row>
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<row>
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||
<entry>WADT</entry>
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<entry>+8:00</entry>
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<entry>West Australian Daylight Time</entry>
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</row>
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<row>
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<entry>WST</entry>
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<entry>+8:00</entry>
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<entry>West Australian Std Time</entry>
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</row>
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<row>
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<entry>JT</entry>
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<entry>+7:30</entry>
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<entry>Java Time</entry>
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</row>
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<row>
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<entry>WAST</entry>
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<entry>+7:00</entry>
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<entry>West Australian Std Time</entry>
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</row>
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<row>
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<entry>IT</entry>
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<entry>+3:30</entry>
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<entry>Iran Time</entry>
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</row>
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<row>
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<entry>BT</entry>
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<entry>+3:00 </entry>
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<entry>Baghdad Time</entry>
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</row>
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<row>
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<entry>EETDST</entry>
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<entry>+3:00 </entry>
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<entry>Eastern Europe Daylight Savings Time</entry>
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</row>
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<row>
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<entry>CETDST</entry>
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<entry>+2:00 </entry>
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<entry>Central European Daylight Savings Time</entry>
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</row>
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<row>
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<entry>EET</entry>
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<entry>+2:00 </entry>
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<entry>Eastern Europe, USSR Zone 1</entry>
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</row>
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<row>
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<entry>FWT</entry>
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<entry>+2:00</entry>
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<entry>French Winter Time</entry>
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</row>
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<row>
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<entry>IST</entry>
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<entry>+2:00</entry>
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<entry>Israel Std Time</entry>
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</row>
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<row>
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<entry>MEST</entry>
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<entry>+2:00</entry>
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<entry>Middle Europe Summer Time</entry>
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</row>
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<row>
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<entry>METDST</entry>
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<entry>+2:00</entry>
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<entry>Middle Europe Daylight Time</entry>
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</row>
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<row>
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<entry>SST</entry>
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<entry>+2:00</entry>
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<entry>Swedish Summer Time</entry>
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</row>
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<row>
|
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<entry>BST</entry>
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<entry>+1:00 </entry>
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<entry>British Summer Time</entry>
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</row>
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<row>
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<entry>CET</entry>
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<entry>+1:00 </entry>
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<entry>Central European Time</entry>
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</row>
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<row>
|
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<entry>DNT</entry>
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<entry>+1:00 </entry>
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<entry>Dansk Normal Tid</entry>
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</row>
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||
<row>
|
||
<entry>DST</entry>
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||
<entry>+1:00 </entry>
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||
<entry>Dansk Standard Time (?)</entry>
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||
</row>
|
||
<row>
|
||
<entry>FST</entry>
|
||
<entry>+1:00 </entry>
|
||
<entry>French Summer Time</entry>
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||
</row>
|
||
<row>
|
||
<entry>MET</entry>
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||
<entry>+1:00</entry>
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||
<entry>Middle Europe Time</entry>
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</row>
|
||
<row>
|
||
<entry>MEWT</entry>
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<entry>+1:00</entry>
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<entry>Middle Europe Winter Time</entry>
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</row>
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||
<row>
|
||
<entry>MEZ</entry>
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<entry>+1:00</entry>
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<entry>Middle Europe Zone</entry>
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</row>
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<row>
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<entry>NOR</entry>
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<entry>+1:00</entry>
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<entry>Norway Standard Time</entry>
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</row>
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||
<row>
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||
<entry>SET</entry>
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||
<entry>+1:00</entry>
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||
<entry>Seychelles Time</entry>
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</row>
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||
<row>
|
||
<entry>SWT</entry>
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||
<entry>+1:00</entry>
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||
<entry>Swedish Winter Time</entry>
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||
</row>
|
||
<row>
|
||
<entry>WETDST</entry>
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||
<entry>+1:00</entry>
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||
<entry>Western Europe Daylight Savings Time</entry>
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||
</row>
|
||
<row>
|
||
<entry>GMT</entry>
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<entry>0:00</entry>
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||
<entry>Greenwish Mean Time</entry>
|
||
</row>
|
||
<row>
|
||
<entry>WET</entry>
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<entry>0:00</entry>
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||
<entry>Western Europe</entry>
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||
</row>
|
||
<row>
|
||
<entry>WAT</entry>
|
||
<entry>-1:00</entry>
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||
<entry>West Africa Time</entry>
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||
</row>
|
||
<row>
|
||
<entry>NDT</entry>
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||
<entry>-2:30</entry>
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||
<entry>Newfoundland Daylight Time</entry>
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||
</row>
|
||
<row>
|
||
<entry>ADT</entry>
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||
<entry>-03:00 </entry>
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||
<entry>Atlantic Daylight Time</entry>
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</row>
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||
<row>
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||
<entry>NFT</entry>
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||
<entry>-3:30</entry>
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||
<entry>Newfoundland Standard Time</entry>
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||
</row>
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||
<row>
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||
<entry>NST</entry>
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||
<entry>-3:30</entry>
|
||
<entry>Newfoundland Standard Time</entry>
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</row>
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||
<row>
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<entry>AST</entry>
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<entry>-4:00 </entry>
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<entry>Atlantic Std Time (Canada)</entry>
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</row>
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||
<row>
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<entry>EDT</entry>
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<entry>-4:00 </entry>
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<entry>Eastern Daylight Time</entry>
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</row>
|
||
<row>
|
||
<entry>ZP4</entry>
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<entry>-4:00</entry>
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<entry>GMT +4 hours</entry>
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</row>
|
||
<row>
|
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<entry>CDT</entry>
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<entry>-5:00 </entry>
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<entry>Central Daylight Time</entry>
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</row>
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<row>
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<entry>EST</entry>
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<entry>-5:00 </entry>
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<entry>Eastern Standard Time</entry>
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</row>
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||
<row>
|
||
<entry>ZP5</entry>
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||
<entry>-5:00</entry>
|
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<entry>GMT +5 hours</entry>
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</row>
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<row>
|
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<entry>CST</entry>
|
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<entry>-6:00 </entry>
|
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<entry>Central Std Time</entry>
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</row>
|
||
<row>
|
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<entry>MDT</entry>
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<entry>-6:00</entry>
|
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<entry>Mountain Daylight Time</entry>
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</row>
|
||
<row>
|
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<entry>ZP6</entry>
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<entry>-6:00</entry>
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<entry>GMT +6 hours</entry>
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</row>
|
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<row>
|
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<entry>MST</entry>
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<entry>-7:00</entry>
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<entry>Mountain Standard Time</entry>
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</row>
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<row>
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<entry>PDT</entry>
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<entry>-7:00</entry>
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<entry>Pacific Daylight Time</entry>
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</row>
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<row>
|
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<entry>PST</entry>
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<entry>-8:00</entry>
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<entry>Pacific Std Time</entry>
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</row>
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<row>
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<entry>YDT</entry>
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<entry>-8:00</entry>
|
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<entry>Yukon Daylight Time</entry>
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</row>
|
||
<row>
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<entry>HDT</entry>
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<entry>-9:00</entry>
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<entry>Hawaii/Alaska Daylight Time</entry>
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</row>
|
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<row>
|
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<entry>YST</entry>
|
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<entry>-9:00</entry>
|
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<entry>Yukon Standard Time</entry>
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</row>
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<row>
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<entry>AHST</entry>
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<entry>-10:00 </entry>
|
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<entry>Alaska-Hawaii Std Time</entry>
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||
</row>
|
||
<row>
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<entry>CAT</entry>
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<entry>-10:00 </entry>
|
||
<entry>Central Alaska Time</entry>
|
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</row>
|
||
<row>
|
||
<entry>NT</entry>
|
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<entry>-11:00</entry>
|
||
<entry>Nome Time</entry>
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</row>
|
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<row>
|
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<entry>IDLW</entry>
|
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<entry>-12:00</entry>
|
||
<entry>International Date Line, West</entry>
|
||
</row>
|
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</tbody>
|
||
</tgroup>
|
||
</table>
|
||
<note>
|
||
<para>
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If the compiler option USE_AUSTRALIAN_RULES is set
|
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then <literal>EST</literal> refers to Australia Eastern Std Time,
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which has an offset of +10:00 hours from UTC.
|
||
</para>
|
||
</note>
|
||
</para>
|
||
|
||
<para>
|
||
Australian time zones and their naming variants
|
||
account for fully one quarter of all time zones in the
|
||
<productname>Postgres</productname> time zone lookup table.
|
||
</para>
|
||
|
||
<procedure>
|
||
<title>Date/Time Input Interpretation</title>
|
||
|
||
<para>
|
||
The date/time types are all decoded using a common set of routines.
|
||
</para>
|
||
|
||
<step>
|
||
<para>
|
||
Break the input string into tokens and categorize each token as
|
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a string, time, time zone, or number.
|
||
</para>
|
||
|
||
<substeps>
|
||
<step>
|
||
<para>
|
||
If the token contains a colon (":"), this is a time string.
|
||
</para>
|
||
</step>
|
||
|
||
<step>
|
||
<para>
|
||
If the token contains a dash ("-"), slash ("/"), or dot ("."),
|
||
this is a date string which may have a text month.
|
||
</para>
|
||
</step>
|
||
|
||
<step>
|
||
<para>
|
||
If the token is numeric only, then it is either a single field
|
||
or an ISO-8601 concatenated date (e.g. "19990113" for January 13, 1999)
|
||
or time (e.g. 141516 for 14:15:16).
|
||
</para>
|
||
</step>
|
||
<step>
|
||
<para>
|
||
If the token starts with a plus ("+") or minus ("-"),
|
||
then it is either a time zone or a special field.
|
||
</para>
|
||
</step>
|
||
</substeps>
|
||
</step>
|
||
|
||
<step>
|
||
<para>
|
||
If the token is a text string, match up with possible strings.
|
||
</para>
|
||
|
||
<substeps>
|
||
<step>
|
||
<para>
|
||
Do a binary-search table lookup for the token
|
||
as either a special string (e.g. <literal>today</literal>),
|
||
day (e.g. <literal>Thursday</literal>),
|
||
month (e.g. <literal>January</literal>), or noise word (e.g. <literal>on</literal>).
|
||
</para>
|
||
<para>
|
||
Set field values and bit mask for fields.
|
||
For example, set year, month, day for <literal>today</literal>, and additionally
|
||
hour, minute, second for <literal>now</literal>.
|
||
</para>
|
||
</step>
|
||
|
||
<step>
|
||
<para>
|
||
If not found, do a similar binary-search table lookup to match
|
||
the token with a time zone.
|
||
</para>
|
||
</step>
|
||
|
||
<step>
|
||
<para>
|
||
If not found, throw an error.
|
||
</para>
|
||
</step>
|
||
</substeps>
|
||
</step>
|
||
|
||
<step>
|
||
<para>
|
||
The token is a number or number field.
|
||
If there are more than 4 digits,
|
||
and if no other date fields have been previously read, then interpret
|
||
as a "concatenated date" (e.g. <literal>19990118</literal>).
|
||
</para>
|
||
|
||
<substeps>
|
||
<step>
|
||
<para>
|
||
If there are more than 4 digits,
|
||
and if no other date fields have been previously read, then interpret
|
||
as a "concatenated date" (e.g. <literal>19990118</literal>).
|
||
</para>
|
||
</step>
|
||
|
||
<step>
|
||
<para>
|
||
If three digits and a year has already been decoded, then interpret as day of year.
|
||
</para>
|
||
</step>
|
||
|
||
<step>
|
||
<para>
|
||
If longer than two digits, then interpret as a year.
|
||
</para>
|
||
</step>
|
||
|
||
<step>
|
||
<para>
|
||
If in European date mode, and if the day field has not yet been read,
|
||
and if the value is less than or equal to 31, then interpret as a day.
|
||
</para>
|
||
</step>
|
||
|
||
<step>
|
||
<para>
|
||
If in non-European (US) date mode, and if the month field has not yet been read,
|
||
and if the value is less than or equal to 12, then interpret as a month.
|
||
</para>
|
||
</step>
|
||
|
||
<step>
|
||
<para>
|
||
If the day field has not yet been read,
|
||
and if the value is less than or equal to 31, then interpret as a month.
|
||
</para>
|
||
</step>
|
||
|
||
<step>
|
||
<para>
|
||
If the month field has not yet been read,
|
||
and if the value is less than or equal to 12, then interpret as a month.
|
||
</para>
|
||
</step>
|
||
|
||
<step>
|
||
<para>
|
||
Otherwise, interpret as a year.
|
||
</para>
|
||
</step>
|
||
</substeps>
|
||
</step>
|
||
|
||
<step>
|
||
<para>
|
||
If BC has been specified, negate the year and offset by one
|
||
(there is no year zero in the Gregorian calendar).
|
||
</para>
|
||
</step>
|
||
|
||
<step>
|
||
<para>
|
||
If BC was not specified, and if the year field was two digits in length, then
|
||
adjust the year to 4 digits. If the field was less than 70, then add 2000;
|
||
otherwise, add 1900.
|
||
</para>
|
||
</step>
|
||
|
||
</procedure>
|
||
</sect1>
|
||
|
||
<sect1>
|
||
<title>History</title>
|
||
|
||
<note>
|
||
<para>
|
||
Contributed by
|
||
<ulink url="jose@sferacarta.com">Jos<6F> Soares</ulink>.
|
||
</para>
|
||
</note>
|
||
|
||
<para>
|
||
The Julian Day invented by the French scholar
|
||
Joseph Justus Scaliger (1540-1609)
|
||
and which probably takes its name from the Scaliger's father,
|
||
the Italian scholar Julius Caesar Scaliger (1484-1558).
|
||
Astronomers have used the Julian period to assign a unique number to
|
||
every day since 1 January 4713 BC. This is the so-called Julian Day
|
||
(JD). JD 0 designates the 24 hours from noon UTC on 1 January 4713 BC
|
||
to noon UTC on 2 January 4713 BC.
|
||
</para>
|
||
|
||
<para>
|
||
Julian Day is different from Julian Date.
|
||
|
||
The Julian calendar was introduced by Julius Caesar in 45 BC. It was
|
||
in common use until the 1582, when countries started changing to the
|
||
Gregorian calendar.
|
||
|
||
In the Julian calendar, the tropical year is approximated as 365 1/4
|
||
days = 365.25 days. This gives an error of 1 day in approximately
|
||
128 days.
|
||
The accumulating calendar error prompted pope Gregory XIII
|
||
to reform the calendar in accordance with instructions
|
||
from the Council of Trent.
|
||
</para>
|
||
|
||
<para>
|
||
In the Gregorian calendar, the tropical year is approximated as
|
||
365 + 97 / 400 days = 365.2425 days. Thus it takes approximately 3300
|
||
years for the tropical year to shift one day with respect to the
|
||
Gregorian calendar.
|
||
</para>
|
||
|
||
<para>
|
||
The approximation 365+97/400 is achieved by having 97 leap years
|
||
every 400 years, using the following rules:
|
||
|
||
<simplelist>
|
||
<member>
|
||
Every year divisible by 4 is a leap year.
|
||
</member>
|
||
<member>
|
||
However, every year divisible by 100 is not a leap year.
|
||
</member>
|
||
<member>
|
||
However, every year divisible by 400 is a leap year after all.
|
||
</member>
|
||
</simplelist>
|
||
|
||
So, 1700, 1800, 1900, 2100, and 2200 are not leap years. But 1600,
|
||
2000, and 2400 are leap years.
|
||
|
||
By contrast, in the older Julian calendar only years divisible by 4 are leap years.
|
||
</para>
|
||
|
||
<para>
|
||
The papal bull of February 1582 decreed that 10 days should be dropped
|
||
from October 1582 so that 15 October should follow immediately after
|
||
4 October.
|
||
This was observed in Italy, Poland, Portugal, and Spain. Other Catholic
|
||
countries followed shortly after, but Protestant countries were
|
||
reluctant to change, and the Greek orthodox countries didn't change
|
||
until the start of this century.
|
||
|
||
The reform was observed by Great Britain and Dominions (including what is
|
||
now the USA) in 1752.
|
||
Thus 2 Sep 1752 was followed by 14 Sep 1752.
|
||
|
||
This is why Unix systems have <application>cal</application>
|
||
produce the following:
|
||
|
||
<programlisting>
|
||
% cal 9 1752
|
||
September 1752
|
||
S M Tu W Th F S
|
||
1 2 14 15 16
|
||
17 18 19 20 21 22 23
|
||
24 25 26 27 28 29 30
|
||
</programlisting>
|
||
</para>
|
||
|
||
<note>
|
||
<para>
|
||
SQL92 states that
|
||
<quote>Within the definition of a <sgmltag>datetime literal</sgmltag>,
|
||
the <sgmltag>datetime value</sgmltag>s are constrained by the
|
||
natural rules for dates and times
|
||
according to the Gregorian calendar</quote>.
|
||
Dates between 1752-09-03 and 1752-09-13, although eliminated in
|
||
some countries by Papal fiat, conform to
|
||
<quote>natural rules</quote> and are hence valid dates.
|
||
</para>
|
||
</note>
|
||
|
||
<para>
|
||
Different calendars have been developed in various parts of the
|
||
world, many predating the Gregorian system.
|
||
|
||
For example,
|
||
the beginnings of the Chinese calendar can be traced back to the 14th
|
||
century BC. Legend has it that the Emperor Huangdi invented the
|
||
calendar in 2637 BC.
|
||
|
||
The People's Republic of China uses the Gregorian calendar
|
||
for civil purposes. Chinese calendar is used for determining
|
||
festivals.
|
||
</para>
|
||
</sect1>
|
||
</appendix>
|
||
|
||
<!-- Keep this comment at the end of the file
|
||
Local variables:
|
||
mode: sgml
|
||
sgml-omittag:nil
|
||
sgml-shorttag:t
|
||
sgml-minimize-attributes:nil
|
||
sgml-always-quote-attributes:t
|
||
sgml-indent-step:1
|
||
sgml-indent-data:t
|
||
sgml-parent-document:nil
|
||
sgml-default-dtd-file:"./reference.ced"
|
||
sgml-exposed-tags:nil
|
||
sgml-local-catalogs:"/usr/lib/sgml/catalog"
|
||
sgml-local-ecat-files:nil
|
||
End:
|
||
-->
|