It won't always give the right answer, because not all days are 24*60*60 seconds long. It's possible for your code to return one more day or one less day than expected.

For example,
it's possible for 4:30am one day to 4:00am the next day to return 1, and
it's possible for 4:00am one day to 4:30am the next day to return 0.

In reply to Re^2: question about unix timestamps (epoch) by ikegami
in thread question about unix timestamps (epoch) by Anonymous Monk

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