The duration to expand the interval by.
The direction in time to expand the interval.
std.datetime.date.DateTimeException this interval is empty or if the resulting interval would be invalid.
auto interval1 = Interval!Date(Date(1996, 1, 2), Date(2012, 3, 1)); auto interval2 = Interval!Date(Date(1996, 1, 2), Date(2012, 3, 1)); interval1.expand(2); assert(interval1 == Interval!Date(Date(1994, 1, 2), Date(2014, 3, 1))); interval2.expand(-2); assert(interval2 == Interval!Date(Date(1998, 1, 2), Date(2010, 3, 1)));
Expands the interval forwards and/or backwards in time. Effectively, it does begin -= duration and/or end += duration. Whether it expands forwards and/or backwards in time is determined by dir.