php - determine whether DateTime falls on a DateInterval -


i trying determine whether datetime coincides possible occurance of dateinterval. intervals i'm using need allow 'nth xday of next month' type format specifications , i'm not sure such thing possible given conditions.

my basic idea invert dateinterval, apply clone of original datetime, put was, apply again , check if 2 datetime instances equal. if so, occurs on interval:

public static function datefallsonperiod(datetime $date, dateinterval $interval) {     $compare = clone $date;      // invert period, apply date, uninvert & reapply     $interval->invert = 1;     $compare->add($interval);     $interval->invert = 0;     $compare->add($interval);      return $date == $compare; }

this seemed apply interval twice in same direction, , tried again using ->sub() , ->add(), resulting in fatal error "datetime::sub(): non-special relative time specifications supported subtraction". seems kind of functionality isn't implemented @ all.

does have better ideas, in lieu of ugly & inefficient solution of choosing offset behind start date , iterating forward until we've matched or gone past?

thanks in advance!

one possibility generate unix timestamps datetime , compare integer values.


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