hi.bat

  @echo off
   for /f "tokens=1-4 delims=/ " %%i in ("%date%") do (
     set dow=%%i
     set month=%%j
     set day=%%k
     set year=%%l
   )
   set datestr=%month%_%day%_%year%
   echo datestr is %datestr%
    
   set BACKUP_FILE=pgdumptest_%datestr%.backup
   echo backup file name is %BACKUP_FILE%
   SET PGPASSWORD=test
   echo on
   pg_dump -h localhost -p 5432 -U postgres -F c -b -v -f c:\backups\%BACKUP_FILE% postgres