iphone - Check if NSTimeInterval equals 0 -

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//gets time right nsdate *now = [nsdate date];  //stores difference in seconds between when test started , now. nstimeinterval interval = [self.expires timeintervalsincedate:now];  if (interval == 0) {     ... }

any reason why condition wont true?

thanks.

since nstimeinterval double, might have floating point rounding error. try using 

if (abs(interval) < eps) {

where eps small enough constant.

or, if want know seconds , not milliseconds, can truncate double int.

but judging code, think might want check if timeline has already expired, not expires @ exact moment. probability of later small. should trick.

if (interval < 0) {

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