Excel Formula to get Number of Days in a Month

It seems Excel still can’t tell me the days in a particular month.

The following formula works, though:

=DAY(DATE(YEAR(A1),MONTH(A1)+1,1)-1)

Obviously, A1 has to have a date in it.

Works like a charm:

 Update, much, much later: Looks like LibreOffice has a DAYSINMONTH function.

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