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Seconds Since the Epoch
This is not at all news, but it comes up often enough that I think there should be a concise explanation of the problem. People, myself included, like to say that POSIX time, also known as Unix time, is the number of seconds since the Unix epoch, which was 1970-01-01 at 00:00:00.
The appendix punts, saying that vendors and administrators must make time align “as closely as necessary”, and that “this value should increase even during leap seconds”. Consistent interpretation of seconds since the Epoch can be critical to certain types of distributed applications that rely on such timestamps to synchronize events. If you do need rough alignment with other POSIX-timestamp systems, smear leap seconds over a longer window of time.
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