Determines the number of days in a month

     LastDayOM([<dDate|nMonth>]) --> nDaysInMonth


     <dDate|nMonth>  Designates either a date or the number of a month.
     The default is the system date.


     LastDayOM() returns the number of days in the month specified by


     To administer due dates and other similar dates, it is useful to know
     the number of days that remain in a month.  Specify either the day's
     date or month as a parameter, and you get the length of the month in
     days.  If you subtract the number of days until today's date, you are
     left with the days that remain until month end.


     .  Without the <dDate|nMonth> parameter, the function
        automatically uses the system date.  If there is an invalid number of
        months, LastDayOM() returns 0 as an error code.


     How many days remain before the end of the month?
     ? DATE(), LastDayOM()
     ? "There are " + STR(LastDayOM() - DAY( DATE() ), 2) +;
        " days until the end of the month"

See Also: EOM()

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