<literal>ts</literal> points to.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="pgtypestimestampfmtasc">
      <term><function>PGTYPEStimestamp_fmt_asc</function></term>
      <listitem>
       <para>
        Convert a timestamp variable to a C char* using a format mask.
<synopsis>
int PGTYPEStimestamp_fmt_asc(timestamp *ts, char *output, int str_len, char *fmtstr);
</synopsis>
        The function receives a pointer to the timestamp to convert as its
        first argument (<literal>ts</literal>), a pointer to the output buffer
        (<literal>output</literal>), the maximal length that has been allocated for
        the output buffer (<literal>str_len</literal>) and the format mask to
        use for the conversion (<literal>fmtstr</literal>).
       </para>
       <para>
        Upon success, the function returns 0 and a negative value if an
        error occurred.
       </para>
       <para>
        You can use the following format specifiers for the format mask. The
        format specifiers are the same ones that are used in the
        <function>strftime</function> function in <productname>libc</productname>. Any
        non-format specifier will be copied into the output buffer.
        <!-- This is from the FreeBSD man page:
             http://www.freebsd.org/cgi/man.cgi?query=strftime&apropos=0&sektion=3&manpath=FreeBSD+7.0-current&format=html
        -->
        <itemizedlist>
         <listitem>
          <para>
           <literal>%A</literal> - is replaced by national representation of
           the full weekday name.
          </para>
         </listitem>
         <listitem>
          <para>
           <literal>%a</literal> - is replaced by national representation of
           the abbreviated weekday name.
          </para>
         </listitem>
         <listitem>
          <para>
           <literal>%B</literal> - is replaced by national representation of
           the full month name.
          </para>
         </listitem>
         <listitem>
          <para>
           <literal>%b</literal> - is replaced by national representation of
           the abbreviated month name.
          </para>
         </listitem>
         <listitem>
          <para>
           <literal>%C</literal> - is replaced by (year / 100) as decimal
           number; single digits are preceded by a zero.
          </para>
         </listitem>
         <listitem>
          <para>
           <literal>%c</literal> - is replaced by national representation of
           time and date.
          </para>
         </listitem>
         <listitem>
          <para>
           <literal>%D</literal> - is equivalent to
           <literal>%m/%d/%y</literal>.
          </para>
         </listitem>
         <listitem>
          <para>
           <literal>%d</literal> - is replaced by the day of the month as a
           decimal number (01&ndash;31).
          </para>
         </listitem>
         <listitem>
          <para>
           <literal>%E*</literal> <literal>%O*</literal> -  POSIX locale
           extensions. The sequences
           <literal>%Ec</literal>
           <literal>%EC</literal>
           <literal>%Ex</literal>
           <literal>%EX</literal>
           <literal>%Ey</literal>
           <literal>%EY</literal>
           <literal>%Od</literal>
           <literal>%Oe</literal>
           <literal>%OH</literal>
           <literal>%OI</literal>
           <literal>%Om</literal>
           <literal>%OM</literal>
           <literal>%OS</literal>
           <literal>%Ou</literal>
           <literal>%OU</literal>
           <literal>%OV</literal>
           <literal>%Ow</literal>
           <literal>%OW</literal>
           <literal>%Oy</literal>
           are supposed to provide alternative representations.
          </para>
          <para>
           Additionally <literal>%OB</literal> implemented to represent
           alternative months names (used standalone, without day mentioned).