LeapYear.vdm is a submacro where you set n-reg 1 to the year, and Leapyear.vdm will set
return_value to 1 if it is a leapyear or 0 if not.
If you want to use my "days between dates" submacro daysdate.vdm, you will need leapyear.vdm as
daysdate.vdm makes several calls to it.
Scott
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