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LastDayInstance ( theDate ; NameOfDay )

Returns the last instance of a given day in the month of the date

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Andrew Sasaki - Show more from this author

  Function definition: (Copy & paste into FileMaker's Edit Custom Function window)

Let ( [ LastDay = Case ( Month ( TheDate ) = 2; If (Mod ( Year ( TheDate ); 4) = 0; 29; 28); Month ( TheDate ) = 4; 30; Month ( TheDate ) = 6; 30; Month (TheDate ) = 9; 30; Month ( TheDate ) = 11; 30; 31); MonthEndDate = Date ( Month ( TheDate); LastDay ; Year ( TheDate )); MonthEndDayOfWeek = DayOfWeek ( MonthEndDate ) ; TargetDay = Case ( NameOfDay = "Sunday"; 1; NameOfDay = "Monday"; 2; NameOfDay = "Tuesday"; 3; NameOfDay = "Wednesday"; 4; NameOfDay = "Thursday"; 5; NameOfDay = "Friday"; 6; 7); DaysDifference = If (TargetDay <= MonthEndDayOfWeek; TargetDay - MonthEndDayOfWeek; (TargetDay - MonthEndDayOfWeek) - 7)] ; Date ( Month ( TheDate); LastDay + DaysDifference ; Year ( TheDate )) ) Click to copy

Given a date and the name of a day, the function returns the last instance of that day in the month -- i.e., the last Thursday of October.

 

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