how about

Day(GOMONTH(date(Year(tDate), Month(tDate), 1), 1) -1)




>Glenn,
>
>It will not work. For instance, try tdate={^2003-01-31}
>
>>You can try:
>>

>>Function DaysInMonth
>>lpar tDate
>>return day(gomonth(tDate,1)-day(tDate))
>>

>>
>>Glenn
>>>Is there a function available to calulate the # of days in a given month from a date() function?
>>>
>>>Jeff