e following environment variables can be used to specify default
   behavior for each <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> session.  (See
   also the <A
HREF="sql-alterrole.html"
>ALTER ROLE</A
>
   and <A
HREF="sql-alterdatabase.html"
>ALTER DATABASE</A
>
   commands for ways to set default behavior on a per-user or per-database
   basis.)

   <P
></P
></P><UL
><LI
><P
>      
      <TT
CLASS="ENVAR"
>PGDATESTYLE</TT
> sets the default style of date/time
      representation.  (Equivalent to <TT
C