
  -spec erlang:time_offset(Unit) -> integer() when Unit :: time_unit().

Since:
  OTP 18.0

  Returns the current time offset between Erlang monotonic time
  and Erlang system time converted into the Unit passed as
  argument.

  Same as calling erlang:convert_time_unit( erlang:time_offset(),
  native, Unit) however optimized for commonly used Units.
