Returns the difference between the two
Dates in months.
int diffMonths (
) pure nothrow @nogc @safe const;
To get the difference in years, subtract the year property
Dates. To get the difference in days or weeks,
Dates themselves and use the
Duration that results. Because converting between
months and smaller units requires a specific date (which
Durations don't have), getting the difference in
months requires some math using both the year and month properties, so
this is a convenience function for getting the difference in months.
Note that the number of days in the months or how far into the month
Date is is irrelevant. It is the difference in the month
property combined with the difference in years * 12. So, for instance,
December 31st and January 1st are one month apart just as December 1st
and January 31st are one month apart.
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