sandorbedo
How to avoid leaps and repetition caused by daylight savings?
Hi,
I have two ways of reading out an integer timestamp (in milliseconds) that seem to give the exact same values:
DateTime.utc_now() |> DateTime.to_unix(:millisecond)
and
System.os_time(:millisecond)
Are these the same under the hood? Are these prone to skipping or repeating an hour when daylight saving happens? Which one should I use when I want to avoid the side effects of daylight savings?
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sodapopcan
josevalim
They are equivalent. They both return the OS time. In production, you generally don’t check the OS time/clock, you keep it in UTC, so there should be no jumps. If you are worried about jumps still, you can use System.monotonic_time.
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