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
How to avoid leaps and repetition caused by daylight savings?
By quitting computer science 
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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