@@ -2020,19 +2020,27 @@ MINUTE TO SECOND
20202020 </row>
20212021 <row>
20222022 <entry><literal>04:05:06.789-8</literal></entry>
2023- <entry>ISO 8601</entry>
2023+ <entry>ISO 8601, with time zone as UTC offset </entry>
20242024 </row>
20252025 <row>
20262026 <entry><literal>04:05:06-08:00</literal></entry>
2027- <entry>ISO 8601</entry>
2027+ <entry>ISO 8601, with time zone as UTC offset </entry>
20282028 </row>
20292029 <row>
20302030 <entry><literal>04:05-08:00</literal></entry>
2031- <entry>ISO 8601</entry>
2031+ <entry>ISO 8601, with time zone as UTC offset </entry>
20322032 </row>
20332033 <row>
20342034 <entry><literal>040506-08</literal></entry>
2035- <entry>ISO 8601</entry>
2035+ <entry>ISO 8601, with time zone as UTC offset</entry>
2036+ </row>
2037+ <row>
2038+ <entry><literal>040506+0730</literal></entry>
2039+ <entry>ISO 8601, with fractional-hour time zone as UTC offset</entry>
2040+ </row>
2041+ <row>
2042+ <entry><literal>040506+07:30:00</literal></entry>
2043+ <entry>UTC offset specified to seconds (not allowed in ISO 8601)</entry>
20362044 </row>
20372045 <row>
20382046 <entry><literal>04:05:06 PST</literal></entry>
@@ -2068,25 +2076,29 @@ MINUTE TO SECOND
20682076 <entry><literal>PST8PDT</literal></entry>
20692077 <entry>POSIX-style time zone specification</entry>
20702078 </row>
2079+ <row>
2080+ <entry><literal>-8:00:00</literal></entry>
2081+ <entry>UTC offset for PST</entry>
2082+ </row>
20712083 <row>
20722084 <entry><literal>-8:00</literal></entry>
2073- <entry>ISO-8601 offset for PST</entry>
2085+ <entry>UTC offset for PST (ISO 8601 extended format) </entry>
20742086 </row>
20752087 <row>
20762088 <entry><literal>-800</literal></entry>
2077- <entry>ISO-8601 offset for PST</entry>
2089+ <entry>UTC offset for PST (ISO 8601 basic format) </entry>
20782090 </row>
20792091 <row>
20802092 <entry><literal>-8</literal></entry>
2081- <entry>ISO-8601 offset for PST</entry>
2093+ <entry>UTC offset for PST (ISO 8601 basic format) </entry>
20822094 </row>
20832095 <row>
20842096 <entry><literal>zulu</literal></entry>
20852097 <entry>Military abbreviation for UTC</entry>
20862098 </row>
20872099 <row>
20882100 <entry><literal>z</literal></entry>
2089- <entry>Short form of <literal>zulu</literal></entry>
2101+ <entry>Short form of <literal>zulu</literal> (also in ISO 8601) </entry>
20902102 </row>
20912103 </tbody>
20922104 </tgroup>
@@ -2437,6 +2449,24 @@ TIMESTAMP WITH TIME ZONE '2004-10-19 10:23:54+02'
24372449 </tgroup>
24382450 </table>
24392451
2452+ <para>
2453+ In the <acronym>ISO</acronym> style, the time zone is always shown as
2454+ a signed numeric offset from UTC, with positive sign used for zones
2455+ east of Greenwich. The offset will be shown
2456+ as <replaceable>hh</replaceable> (hours only) if it is an integral
2457+ number of hours, else
2458+ as <replaceable>hh</replaceable>:<replaceable>mm</replaceable> if it
2459+ is an integral number of minutes, else as
2460+ <replaceable>hh</replaceable>:<replaceable>mm</replaceable>:<replaceable>ss</replaceable>.
2461+ (The third case is not possible with any modern time zone standard,
2462+ but it can appear when working with timestamps that predate the
2463+ adoption of standardized time zones.)
2464+ In the other date styles, the time zone is shown as an alphabetic
2465+ abbreviation if one is in common use in the current zone. Otherwise
2466+ it appears as a signed numeric offset in ISO 8601 basic format
2467+ (<replaceable>hh</replaceable> or <replaceable>hhmm</replaceable>).
2468+ </para>
2469+
24402470 <para>
24412471 The date/time style can be selected by the user using the
24422472 <command>SET datestyle</command> command, the <xref