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Changing Elixir DateTime Precision 

DateTime.truncate(datetime, precision)

Calling this function on a DateTime allows you to change the level of precision from microsecond, :millisecond, or :second.

now = DateTime.utc_now()
# => ~U[2023-10-09 17:52:05.305420Z]

DateTime.truncate(now, :second)
# => ~U[2023-10-09 17:52:39Z]
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