PosInfInterval.expand

void expand(D)(D duration) if (__traits(compiles, begin + duration)) pure nothrow

Expands the interval backwards in time. Effectively, it does begin -= duration.

Parameters

durationThe duration to expand the interval by. Example: 
auto interval1 = PosInfInterval!Date(Date(1996, 1, 2));
auto interval2 = PosInfInterval!Date(Date(1996, 1, 2));

interval1.expand(dur!"days"(2));
assert(interval1 == PosInfInterval!Date(Date(1995, 12, 31)));

interval2.expand(dur!"days"(-2));
assert(interval2 == PosInfInterval!Date(Date(1996, 1, 4)));