std.datetime.date.DateTimeException if either interval is empty.
assert(!Interval!Date(Date(1996, 1, 2), Date(2012, 3, 1)).contains( Interval!Date(Date(1990, 7, 6), Date(2000, 8, 2)))); assert(Interval!Date(Date(1996, 1, 2), Date(2012, 3, 1)).contains( Interval!Date(Date(1999, 1, 12), Date(2011, 9, 17)))); assert(!Interval!Date(Date(1996, 1, 2), Date(2012, 3, 1)).contains( Interval!Date(Date(1998, 2, 28), Date(2013, 5, 1))));
Whether the given interval is completely within this interval.