leapyear ( date )
Calculates if a certain year is a leapyear
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Leapyear (1/1/2000) ;
Function definition: (Copy & paste into FileMaker's Edit Custom Function window)
A leapyear is a year that occurs once every 4 years and 400 years. The year 1900 , 2100 etc won't be a leapyear. 2000 was.
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