Testing of date/datetime range anchors requires too much logic.

[rquadling]

Currently, to test a DateRange (or DateTimeRange) to see if it is anchored in the PAST/FUTURE or both (INFINITE), you have to create a new DateTime(DateRange::PAST) or DateTime(DateTimeRange::PAST).

#7 allows you to simply test your existing range (date or datetime).

$dr1 = new DateRange(new DateTime('2006-09-06'), new DateTime('2006-09-15'));
$dr1->isPast(); // false

[gws]

Closed by #7. Thanks!