<literal>%v</literal> - is equivalent to
           <literal>%e-%b-%Y</literal>.
          </para>
         </listitem>
         <listitem>
          <para>
           <literal>%W</literal> - is replaced by the week number of the year
           (Monday as the first day of the week) as a decimal number (00&ndash;53).
          </para>
         </listitem>
         <listitem>
          <para>
           <literal>%w</literal> - is replaced by the weekday (Sunday as the
           first day of the week) as a decimal number (0&ndash;6).
          </para>
         </listitem>
         <listitem>
          <para>
           <literal>%X</literal> - is replaced by national representation of
           the time.
          </para>
         </listitem>
         <listitem>
          <para>
           <literal>%x</literal> - is replaced by national representation of
           the date.
          </para>
         </listitem>
         <listitem>
          <para>
           <literal>%Y</literal> - is replaced by the year with century as a
           decimal number.
          </para>
         </listitem>
         <listitem>
          <para>
           <literal>%y</literal> - is replaced by the year without century as a
           decimal number (00&ndash;99).
          </para>
         </listitem>
         <listitem>
          <para>
           <literal>%Z</literal> - is replaced by the time zone name.
          </para>
         </listitem>
         <listitem>
          <para>
           <literal>%z</literal> - is replaced by the time zone offset from
           UTC; a leading plus sign stands for east of UTC, a minus sign for
           west of UTC, hours and minutes follow with two digits each and no
           delimiter between them (common form for <ulink url="https://datatracker.ietf.org/doc/html/rfc822">RFC 822</ulink> date headers).
          </para>
         </listitem>
         <listitem>
          <para>
           <literal>%+</literal> - is replaced by national representation of
           the date and time.
          </para>
         </listitem>
         <listitem>
          <para>
           <literal>%-*</literal> - GNU libc extension. Do not do any padding
           when performing numerical outputs.
          </para>
         </listitem>
         <listitem>
          <para>
           $_* - GNU libc extension.    Explicitly specify space for padding.
          </para>
         </listitem>
         <listitem>
          <para>
           <literal>%0*</literal> - GNU libc extension. Explicitly specify zero
           for padding.
          </para>
         </listitem>
         <listitem>
          <para>
           <literal>%%</literal> - is replaced by <literal>%</literal>.
          </para>
         </listitem>
        </itemizedlist>
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="pgtypestimestampsub">
      <term><function>PGTYPEStimestamp_sub</function></term>
      <listitem>
       <para>
        Subtract one timestamp from another one and save the result in a
        variable of type interval.
<synopsis>
int PGTYPEStimestamp_sub(timestamp *ts1, timestamp *ts2, interval *iv);
</synopsis>
        The function will subtract the timestamp variable that <literal>ts2</literal>
        points to from the timestamp variable that <literal>ts1</literal> points to
        and will store the result in the interval variable that <literal>iv</literal>
        points to.
       </para>
       <para>
        Upon success, the function returns 0 and a negative value if an
        error occurred.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="pgtypestimestampdefmtasc">
      <term><function>PGTYPEStimestamp_defmt_asc</function></term>
      <listitem>
       <para>
        Parse a timestamp value from its textual representation using a
        formatting mask.
<synopsis>
int PGTYPEStimestamp_defmt_asc(char *str, char *fmt, timestamp *d);
</synopsis>
        The function receives