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Doc: add info about timestamps with fractional-minute UTC offsets.

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Our code has supported fractional-minute UTC offsets for ages, but
there was no mention of the possibility in the main docs, and only
a very indirect reference in Appendix B.  Improve that.

Discussion: https://postgr.es/m/162543102827.697.5755498651217979813@wrigleys.postgresql.org
This commit is contained in:
Tom Lane 2021-07-06 10:34:51 -04:00
parent 76c23bbb4b
commit 151d30e4ff
1 changed files with 38 additions and 8 deletions
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46
doc/src/sgml/datatype.sgml
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@ -1932,19 +1932,27 @@ MINUTE TO SECOND
</row>
<row>
<entry><literal>04:05:06.789-8</literal></entry>
<entry>ISO 8601</entry>
<entry>ISO 8601, with time zone as UTC offset</entry>
</row>
<row>
<entry><literal>04:05:06-08:00</literal></entry>
<entry>ISO 8601</entry>
<entry>ISO 8601, with time zone as UTC offset</entry>
</row>
<row>
<entry><literal>04:05-08:00</literal></entry>
<entry>ISO 8601</entry>
<entry>ISO 8601, with time zone as UTC offset</entry>
</row>
<row>
<entry><literal>040506-08</literal></entry>
<entry>ISO 8601</entry>
<entry>ISO 8601, with time zone as UTC offset</entry>
</row>
<row>
<entry><literal>040506+0730</literal></entry>
<entry>ISO 8601, with fractional-hour time zone as UTC offset</entry>
</row>
<row>
<entry><literal>040506+07:30:00</literal></entry>
<entry>UTC offset specified to seconds (not allowed in ISO 8601)</entry>
</row>
<row>
<entry><literal>04:05:06 PST</literal></entry>
@ -1980,17 +1988,21 @@ MINUTE TO SECOND
<entry><literal>PST8PDT</literal></entry>
<entry>POSIX-style time zone specification</entry>
</row>
<row>
<entry><literal>-8:00:00</literal></entry>
<entry>UTC offset for PST</entry>
</row>
<row>
<entry><literal>-8:00</literal></entry>
<entry>ISO-8601 offset for PST</entry>
<entry>UTC offset for PST (ISO 8601 extended format)</entry>
</row>
<row>
<entry><literal>-800</literal></entry>
<entry>ISO-8601 offset for PST</entry>
<entry>UTC offset for PST (ISO 8601 basic format)</entry>
</row>
<row>
<entry><literal>-8</literal></entry>
<entry>ISO-8601 offset for PST</entry>
<entry>UTC offset for PST (ISO 8601 basic format)</entry>
</row>
<row>
<entry><literal>zulu</literal></entry>
@ -1998,7 +2010,7 @@ MINUTE TO SECOND
</row>
<row>
<entry><literal>z</literal></entry>
<entry>Short form of <literal>zulu</literal></entry>
<entry>Short form of <literal>zulu</literal> (also in ISO 8601)</entry>
</row>
</tbody>
</tgroup>
@ -2336,6 +2348,24 @@ January 8 04:05:06 1999 PST
</tgroup>
</table>
<para>
In the <acronym>ISO</acronym> style, the time zone is always shown as
a signed numeric offset from UTC, with positive sign used for zones
east of Greenwich. The offset will be shown
as <replaceable>hh</replaceable> (hours only) if it is an integral
number of hours, else
as <replaceable>hh</replaceable>:<replaceable>mm</replaceable> if it
is an integral number of minutes, else as
<replaceable>hh</replaceable>:<replaceable>mm</replaceable>:<replaceable>ss</replaceable>.
(The third case is not possible with any modern time zone standard,
but it can appear when working with timestamps that predate the
adoption of standardized time zones.)
In the other date styles, the time zone is shown as an alphabetic
abbreviation if one is in common use in the current zone. Otherwise
it appears as a signed numeric offset in ISO 8601 basic format
(<replaceable>hh</replaceable> or <replaceable>hhmm</replaceable>).
</para>
<para>
The date/time style can be selected by the user using the
<command>SET datestyle</command> command, the <xref