No, it does not work either.
Try tdate={^2000-05-31} for instance.

>Good call Yuri,
>
>But this will work:
>

>day(gomonth(tDate-DAY(tdate),1))
>

>
>Glenn
>
>>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