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How to Think About Time in Programming
Personal website of Shan Rauf.
While the seconds-from-epoch model is a useful way to talk about durations and instants, humans don't generally say "Wanna grab lunch at 1,748,718,000 seconds from the Unix epoch?" For example, if your program only handles datetimes from 1970 - 2038, Unix time can represent them using 32-bit integers (so you potentially reduce memory and CPU usage by keeping the representation to 32 bits). The International Earth Rotation and Reference Systems Service (IERS) tracks the current UTC time by averaging hundreds of atomic clocks globally.
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