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Editorial Team
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Asked: 2026-06-11T21:47:42+00:00

I am using NSDate to measure execution of program. I create instance of NSDate

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I am using NSDate to measure execution of program. I create instance of NSDate at start and then at end create new instance endDate and call:

[startDate timeIntervalSinceDate: endDate]

This works fine, but I am interested what will happen if program starts executing before DST change, and finishes after. Will startDate be percived to be in future, and timeInterval method would return negative value?

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  1. Editorial Team

    It would seem that what Darren has implied is true. NSDate is a reference to an interval from an absolute reference date, January 1, 2001 00:00 GMT. So the class method [NSDate date] will return a representation of that interval. So the date will not be percived to be in the future.

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