NervesTimeZones.set_time_zone

You're seeing just the function set_time_zone, go back to NervesTimeZones module for more information.
Link to this function

set_time_zone(time_zone)

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Specs

set_time_zone(String.t()) :: :ok | {:error, any()}

Set the local time zone

Only known time zone names can be set. Others will return an error. "Etc/UTC" should always be available.

This time zone will be persisted and restored after a reboot.