# ISDAY.COM

    ISDAY is a small program to use if you want some program to run only
    on specific days.

    Format : ISDAY [/Nmday] [/Dday] [/Mmonth] [/H]

    mday  = day of the month,  1 to 31
    day   = day in the week,   0=sunday .. 6=saturday
    month = month in the year, 1=january .. 12=december
    All parameters are anded.

    Each parameter can be specified as a value, or as an interval
    like "1,3,12-22", that is the first, third and 12th to 22nd

    ISDAY exits with ERRORLEVEL 0 if parameters match else with ERRORLEVEL 1

    Example :

    ISDAY /D0-2
    IF ERRORLEVEL 1 GOTO LABEL
    PROGRAM TO RUN ON SUNDAYS, MONDAYS and TUESDAYS
    :LABEL
    ...

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