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.EXAMPLE.....: 18 Determine if parm %1 contains a valid date .ALIAS.......: 18 .CATEGORY....: examples .CODE........: COMMENT Note that we throw away the FDATE output by redirecting it to NUL. All we really want here is the errorlevel, which tells us whether or not the string in %1 is a valid year. Fdate /Fv /Imm-dd-ccyy /A%1 >nul if errorlevel 1 echo Parm 1 was not a valid date: %1 if errorlevel 1 goto endit :: :: Put the body of your batch file here. :: :endit