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-rw-r--r--doc/src/sgml/datatype.sgml507
1 files changed, 276 insertions, 231 deletions
diff --git a/doc/src/sgml/datatype.sgml b/doc/src/sgml/datatype.sgml
index 1a8dcadda48..e6ff993b104 100644
--- a/doc/src/sgml/datatype.sgml
+++ b/doc/src/sgml/datatype.sgml
@@ -1255,19 +1255,24 @@ the time zone becomes GMT (on most systems anyway).
</thead>
<tbody>
<row>
- <entry>ACSST</entry>
- <entry>+10:30 </entry>
- <entry>Central Australia Summer Std Time</entry>
+ <entry>NZDT</entry>
+ <entry>+13:00</entry>
+ <entry>New Zealand Daylight Time</entry>
</row>
<row>
- <entry>ACST</entry>
- <entry>+09:30 </entry>
- <entry>Central Australia Std Time</entry>
+ <entry>IDLE</entry>
+ <entry>+12:00</entry>
+ <entry>International Date Line, East</entry>
</row>
<row>
- <entry>ADT</entry>
- <entry>-02:00 </entry>
- <entry>Atlantic Daylight Time</entry>
+ <entry>NZST</entry>
+ <entry>+12:00</entry>
+ <entry>New Zealand Std Time</entry>
+ </row>
+ <row>
+ <entry>NZT</entry>
+ <entry>+12:00</entry>
+ <entry>New Zealand Time</entry>
</row>
<row>
<entry>AESST</entry>
@@ -1275,44 +1280,44 @@ the time zone becomes GMT (on most systems anyway).
<entry>Australia Eastern Summer Std Time</entry>
</row>
<row>
- <entry>AEST</entry>
- <entry>+10:00 </entry>
- <entry>Australia Eastern Std Time</entry>
+ <entry>ACSST</entry>
+ <entry>+10:30 </entry>
+ <entry>Central Australia Summer Std Time</entry>
</row>
<row>
- <entry>AHST</entry>
- <entry>-10:00 </entry>
- <entry>Alaska-Hawaii Std Time</entry>
+ <entry>CADT</entry>
+ <entry>+10:30 </entry>
+ <entry>Central Australia Daylight Savings Time</entry>
</row>
<row>
- <entry>AST</entry>
- <entry>-4:00 </entry>
- <entry>Atlantic Std Time (Canada)</entry>
+ <entry>SADT</entry>
+ <entry>+10:30</entry>
+ <entry>South Australian Daylight Time</entry>
</row>
<row>
- <entry>AWSST</entry>
- <entry>+9:00 </entry>
- <entry>Australia Western Summer Std Time</entry>
+ <entry>AEST</entry>
+ <entry>+10:00 </entry>
+ <entry>Australia Eastern Std Time</entry>
</row>
<row>
- <entry>AWST</entry>
- <entry>+8:00 </entry>
- <entry>Australia Western Std Time</entry>
+ <entry>EAST</entry>
+ <entry>+10:00 </entry>
+ <entry>East Australian Std Time</entry>
</row>
<row>
- <entry>BST</entry>
- <entry>+1:00 </entry>
- <entry>British Summer Time</entry>
+ <entry>GST</entry>
+ <entry>+10:00</entry>
+ <entry>Guam Std Time, USSR Zone 9</entry>
</row>
<row>
- <entry>BT</entry>
- <entry>+3:00 </entry>
- <entry>Baghdad Time</entry>
+ <entry>LIGT</entry>
+ <entry>+10:00</entry>
+ <entry>Melbourne, Australia</entry>
</row>
<row>
- <entry>CADT</entry>
- <entry>+10:30 </entry>
- <entry>Central Australia Daylight Savings Time</entry>
+ <entry>ACST</entry>
+ <entry>+09:30 </entry>
+ <entry>Central Australia Std Time</entry>
</row>
<row>
<entry>CAST</entry>
@@ -1320,144 +1325,139 @@ the time zone becomes GMT (on most systems anyway).
<entry>Central Australia Std Time</entry>
</row>
<row>
- <entry>CAT</entry>
- <entry>-10:00 </entry>
- <entry>Central Alaska Time</entry>
- </row>
- <row>
- <entry>CCT</entry>
- <entry>+8:00 </entry>
- <entry>China Coastal Time</entry>
+ <entry>SAT</entry>
+ <entry>+9:30</entry>
+ <entry>South Australian Std Time</entry>
</row>
<row>
- <entry>CDT</entry>
- <entry>-5:00 </entry>
- <entry>Central Daylight Time</entry>
+ <entry>AWSST</entry>
+ <entry>+9:00 </entry>
+ <entry>Australia Western Summer Std Time</entry>
</row>
<row>
- <entry>CET</entry>
- <entry>+1:00 </entry>
- <entry>Central European Time</entry>
+ <entry>JST</entry>
+ <entry>+9:00</entry>
+ <entry>Japan Std Time,USSR Zone 8</entry>
</row>
<row>
- <entry>CETDST</entry>
- <entry>+2:00 </entry>
- <entry>Central European Daylight Savings Time</entry>
+ <entry>KST</entry>
+ <entry>+9:00</entry>
+ <entry>Korea Standard Time</entry>
</row>
<row>
- <entry>CST</entry>
- <entry>+6:00 </entry>
- <entry>Central Std Time</entry>
+ <entry>WDT</entry>
+ <entry>+9:00</entry>
+ <entry>West Australian Daylight Time</entry>
</row>
<row>
- <entry>DNT</entry>
- <entry>+1:00 </entry>
- <entry>Dansk Normal Tid</entry>
+ <entry>MT</entry>
+ <entry>+8:30</entry>
+ <entry>Moluccas Time</entry>
</row>
<row>
- <entry>DST</entry>
- <entry>+1:00 </entry>
- <entry>Dansk Standard Time (?)</entry>
+ <entry>AWST</entry>
+ <entry>+8:00 </entry>
+ <entry>Australia Western Std Time</entry>
</row>
<row>
- <entry>EAST</entry>
- <entry>+10:00 </entry>
- <entry>East Australian Std Time</entry>
+ <entry>CCT</entry>
+ <entry>+8:00 </entry>
+ <entry>China Coastal Time</entry>
</row>
<row>
- <entry>EDT</entry>
- <entry>-4:00 </entry>
- <entry>Eastern Daylight Time</entry>
+ <entry>WADT</entry>
+ <entry>+8:00</entry>
+ <entry>West Australian Daylight Time</entry>
</row>
<row>
- <entry>EET</entry>
- <entry>+2:00 </entry>
- <entry>Eastern Europe, USSR Zone 1</entry>
+ <entry>WST</entry>
+ <entry>+8:00</entry>
+ <entry>West Australian Std Time</entry>
</row>
<row>
- <entry>EETDST</entry>
- <entry>+3:00 </entry>
- <entry>Eastern Europe Daylight Savings Time</entry>
+ <entry>JT</entry>
+ <entry>+7:30</entry>
+ <entry>Java Time</entry>
</row>
<row>
- <entry>EST</entry>
- <entry>-5:00 </entry>
- <entry>Eastern Standard Time</entry>
+ <entry>WAST</entry>
+ <entry>+7:00</entry>
+ <entry>West Australian Std Time</entry>
</row>
<row>
- <entry>FST</entry>
- <entry>+1:00 </entry>
- <entry>French Summer Time</entry>
+ <entry>IT</entry>
+ <entry>+3:30</entry>
+ <entry>Iran Time</entry>
</row>
<row>
- <entry>FWT</entry>
- <entry>+2:00</entry>
- <entry>French Winter Time</entry>
+ <entry>BT</entry>
+ <entry>+3:00 </entry>
+ <entry>Baghdad Time</entry>
</row>
<row>
- <entry>GMT</entry>
- <entry>0:00</entry>
- <entry>Greenwish Mean Time</entry>
+ <entry>EETDST</entry>
+ <entry>+3:00 </entry>
+ <entry>Eastern Europe Daylight Savings Time</entry>
</row>
<row>
- <entry>GST</entry>
- <entry>+10:00</entry>
- <entry>Guam Std Time, USSR Zone 9</entry>
+ <entry>CETDST</entry>
+ <entry>+2:00 </entry>
+ <entry>Central European Daylight Savings Time</entry>
</row>
<row>
- <entry>HDT</entry>
- <entry>-9:00</entry>
- <entry>Hawaii/Alaska</entry>
+ <entry>EET</entry>
+ <entry>+2:00 </entry>
+ <entry>Eastern Europe, USSR Zone 1</entry>
</row>
<row>
- <entry>IDLE</entry>
- <entry>+12:00</entry>
- <entry>International Date Line, East</entry>
+ <entry>FWT</entry>
+ <entry>+2:00</entry>
+ <entry>French Winter Time</entry>
</row>
<row>
- <entry>IDLW</entry>
- <entry>-12:00</entry>
- <entry>International Date Line, West</entry>
+ <entry>IST</entry>
+ <entry>+2:00</entry>
+ <entry>Israel Std Time</entry>
</row>
<row>
- <entry>IST</entry>
+ <entry>MEST</entry>
<entry>+2:00</entry>
- <entry>Israel</entry>
+ <entry>Middle Europe Summer Time</entry>
</row>
<row>
- <entry>IT</entry>
- <entry>+3:40</entry>
- <entry>Iran Time</entry>
+ <entry>METDST</entry>
+ <entry>+2:00</entry>
+ <entry>Middle Europe Daylight Time</entry>
</row>
<row>
- <entry>JST</entry>
- <entry>+9:00</entry>
- <entry>Japan Std Time,USSR Zone 8</entry>
+ <entry>SST</entry>
+ <entry>+2:00</entry>
+ <entry>Swedish Summer Time</entry>
</row>
<row>
- <entry>JT</entry>
- <entry>+7:30</entry>
- <entry>Java Time</entry>
+ <entry>BST</entry>
+ <entry>+1:00 </entry>
+ <entry>British Summer Time</entry>
</row>
<row>
- <entry>KST</entry>
- <entry>+9:00</entry>
- <entry>Korea Standard Time</entry>
+ <entry>CET</entry>
+ <entry>+1:00 </entry>
+ <entry>Central European Time</entry>
</row>
<row>
- <entry>LIGT</entry>
- <entry>+10:00</entry>
- <entry>Melbourne, Australia</entry>
+ <entry>DNT</entry>
+ <entry>+1:00 </entry>
+ <entry>Dansk Normal Tid</entry>
</row>
<row>
- <entry>MDT</entry>
- <entry>-6:00</entry>
- <entry>Mountain Daylight Time</entry>
+ <entry>DST</entry>
+ <entry>+1:00 </entry>
+ <entry>Dansk Standard Time (?)</entry>
</row>
<row>
- <entry>MEST</entry>
- <entry>+2:00</entry>
- <entry>Middle Europe Summer Time</entry>
+ <entry>FST</entry>
+ <entry>+1:00 </entry>
+ <entry>French Summer Time</entry>
</row>
<row>
<entry>MET</entry>
@@ -1465,11 +1465,6 @@ the time zone becomes GMT (on most systems anyway).
<entry>Middle Europe Time</entry>
</row>
<row>
- <entry>METDST</entry>
- <entry>+2:00</entry>
- <entry>Middle Europe Daylight Time</entry>
- </row>
- <row>
<entry>MEWT</entry>
<entry>+1:00</entry>
<entry>Middle Europe Winter Time</entry>
@@ -1480,124 +1475,119 @@ the time zone becomes GMT (on most systems anyway).
<entry>Middle Europe Zone</entry>
</row>
<row>
- <entry>MST</entry>
- <entry>-7:00</entry>
- <entry>Mountain Standard Time</entry>
- </row>
- <row>
- <entry>MT</entry>
- <entry>+8:30</entry>
- <entry>Moluccas Time</entry>
+ <entry>NOR</entry>
+ <entry>+1:00</entry>
+ <entry>Norway Standard Time</entry>
</row>
<row>
- <entry>NDT</entry>
- <entry>-2:30</entry>
- <entry>Newfoundland Daylight Time</entry>
+ <entry>SET</entry>
+ <entry>+1:00</entry>
+ <entry>Seychelles Time</entry>
</row>
<row>
- <entry>NFT</entry>
- <entry>-3:30</entry>
- <entry>Newfoundland Standard Time</entry>
+ <entry>SWT</entry>
+ <entry>+1:00</entry>
+ <entry>Swedish Winter Time</entry>
</row>
<row>
- <entry>NOR</entry>
+ <entry>WETDST</entry>
<entry>+1:00</entry>
- <entry>Norway Standard Time</entry>
+ <entry>Western Europe Daylight Savings Time</entry>
</row>
<row>
- <entry>NST</entry>
- <entry>-3:30</entry>
- <entry>Newfoundland Standard Time</entry>
+ <entry>GMT</entry>
+ <entry>0:00</entry>
+ <entry>Greenwish Mean Time</entry>
</row>
<row>
- <entry>NT</entry>
- <entry>-11:00</entry>
- <entry>Nome Time</entry>
+ <entry>WET</entry>
+ <entry>0:00</entry>
+ <entry>Western Europe</entry>
</row>
<row>
- <entry>NZDT</entry>
- <entry>+13:00</entry>
- <entry>New Zealand Daylight Time</entry>
+ <entry>WAT</entry>
+ <entry>-1:00</entry>
+ <entry>West Africa Time</entry>
</row>
<row>
- <entry>NZST</entry>
- <entry>+12:00</entry>
- <entry>New Zealand Std Time</entry>
+ <entry>NDT</entry>
+ <entry>-2:30</entry>
+ <entry>Newfoundland Daylight Time</entry>
</row>
<row>
- <entry>NZT</entry>
- <entry>+12:00</entry>
- <entry>New Zealand Time</entry>
+ <entry>ADT</entry>
+ <entry>-03:00 </entry>
+ <entry>Atlantic Daylight Time</entry>
</row>
<row>
- <entry>PDT</entry>
- <entry>-7:00</entry>
- <entry>Pacific Daylight Time</entry>
+ <entry>NFT</entry>
+ <entry>-3:30</entry>
+ <entry>Newfoundland Standard Time</entry>
</row>
<row>
- <entry>PST</entry>
- <entry>-8:00</entry>
- <entry>Pacific Std Time</entry>
+ <entry>NST</entry>
+ <entry>-3:30</entry>
+ <entry>Newfoundland Standard Time</entry>
</row>
<row>
- <entry>SADT</entry>
- <entry>+10:30</entry>
- <entry>South Australian Daylight Time</entry>
+ <entry>AST</entry>
+ <entry>-4:00 </entry>
+ <entry>Atlantic Std Time (Canada)</entry>
</row>
<row>
- <entry>SAT</entry>
- <entry>+9:30</entry>
- <entry>South Australian Std Time</entry>
+ <entry>EDT</entry>
+ <entry>-4:00 </entry>
+ <entry>Eastern Daylight Time</entry>
</row>
<row>
- <entry>SET</entry>
- <entry>+1:00</entry>
- <entry>Seychelles Time</entry>
+ <entry>ZP4</entry>
+ <entry>-4:00</entry>
+ <entry>GMT +4 hours</entry>
</row>
<row>
- <entry>SST</entry>
- <entry>+2:00</entry>
- <entry>Swedish Summer Time</entry>
+ <entry>CDT</entry>
+ <entry>-5:00 </entry>
+ <entry>Central Daylight Time</entry>
</row>
<row>
- <entry>SWT</entry>
- <entry>+1:00</entry>
- <entry>Swedish Winter Time</entry>
+ <entry>EST</entry>
+ <entry>-5:00 </entry>
+ <entry>Eastern Standard Time</entry>
</row>
<row>
- <entry>WADT</entry>
- <entry>+8:00</entry>
- <entry>West Australian Daylight Time</entry>
+ <entry>ZP5</entry>
+ <entry>-5:00</entry>
+ <entry>GMT +5 hours</entry>
</row>
<row>
- <entry>WAST</entry>
- <entry>+7:00</entry>
- <entry>West Australian Std Time</entry>
+ <entry>CST</entry>
+ <entry>-6:00 </entry>
+ <entry>Central Std Time</entry>
</row>
<row>
- <entry>WAT</entry>
- <entry>-1:00</entry>
- <entry>West Africa Time</entry>
+ <entry>MDT</entry>
+ <entry>-6:00</entry>
+ <entry>Mountain Daylight Time</entry>
</row>
<row>
- <entry>WDT</entry>
- <entry>+9:00</entry>
- <entry>West Australian Daylight Time</entry>
+ <entry>ZP6</entry>
+ <entry>-6:00</entry>
+ <entry>GMT +6 hours</entry>
</row>
<row>
- <entry>WET</entry>
- <entry>0:00</entry>
- <entry>Western Europe</entry>
+ <entry>MST</entry>
+ <entry>-7:00</entry>
+ <entry>Mountain Standard Time</entry>
</row>
<row>
- <entry>WETDST</entry>
- <entry>+1:00</entry>
- <entry>Western Europe Daylight Savings Time</entry>
+ <entry>PDT</entry>
+ <entry>-7:00</entry>
+ <entry>Pacific Daylight Time</entry>
</row>
<row>
- <entry>WST</entry>
- <entry>+8:00</entry>
- <entry>West Australian Std Time</entry>
+ <entry>PST</entry>
+ <entry>-8:00</entry>
+ <entry>Pacific Std Time</entry>
</row>
<row>
<entry>YDT</entry>
@@ -1605,24 +1595,34 @@ the time zone becomes GMT (on most systems anyway).
<entry>Yukon Daylight Time</entry>
</row>
<row>
+ <entry>HDT</entry>
+ <entry>-9:00</entry>
+ <entry>Hawaii/Alaska Daylight Time</entry>
+ </row>
+ <row>
<entry>YST</entry>
<entry>-9:00</entry>
<entry>Yukon Standard Time</entry>
</row>
<row>
- <entry>ZP4</entry>
- <entry>-4:00</entry>
- <entry>GMT +4 hours</entry>
+ <entry>AHST</entry>
+ <entry>-10:00 </entry>
+ <entry>Alaska-Hawaii Std Time</entry>
</row>
<row>
- <entry>ZP5</entry>
- <entry>-5:00</entry>
- <entry>GMT +5 hours</entry>
+ <entry>CAT</entry>
+ <entry>-10:00 </entry>
+ <entry>Central Alaska Time</entry>
</row>
<row>
- <entry>ZP6</entry>
- <entry>-6:00</entry>
- <entry>GMT +6 hours</entry>
+ <entry>NT</entry>
+ <entry>-11:00</entry>
+ <entry>Nome Time</entry>
+ </row>
+ <row>
+ <entry>IDLW</entry>
+ <entry>-12:00</entry>
+ <entry>International Date Line, West</entry>
</row>
</tbody>
</tgroup>
@@ -1633,17 +1633,21 @@ the time zone becomes GMT (on most systems anyway).
then <literal>EST</literal> refers to Australia Eastern Std Time,
which has an offset of +10:00 hours from UTC.
</para>
-
- <para>
- It is interesting that 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>
</note>
+
+ <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
@@ -1717,48 +1721,89 @@ the time zone becomes GMT (on most systems anyway).
<step>
<para>
- The token is a number or number field. If there are more than 4 digits,
+ 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".
+ as a "concatenated date" (e.g. <literal>19990118</literal>).
</para>
<substeps>
<step>
- <para>If there </para>
+ <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>
- </substeps>
- </step>
- <step>
- <para>
- </para>
- </step>
+ <step>
+ <para>
+ If three digits and a year has already been decoded, then interpret as day of year.
+ </para>
+ </step>
- <step>
- <para>
- </para>
- </step>
+ <step>
+ <para>
+ If longer than two digits, then interpret as a year.
+ </para>
+ </step>
- <step>
- <para>
- </para>
+ <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>
-</sect2>
+ </sect2>
-<sect2>
-<title>datetime</title>
+ <sect2>
+ <title>datetime</title>
<para>
General-use date and time is input using a wide range of
@@ -2377,7 +2422,7 @@ the bits part.
<!-- Keep this comment at the end of the file
Local variables:
mode: sgml
-sgml-omittag:t
+sgml-omittag:nil
sgml-shorttag:t
sgml-minimize-attributes:nil
sgml-always-quote-attributes:t
generated by cgit v1.2.3 (git 2.25.1) at 2025-05-31 06:22:44 +0000