
  [;1m-spec localtime_to_universaltime(Localtime) -> Universaltime[0m
  [;1m                                    when[0m
  [;1m                                        Localtime :: calendar:datetime(),[0m
  [;1m                                        Universaltime ::[0m
  [;1m                                            calendar:datetime().[0m

  Converts local date and time to Universal Time Coordinated (UTC),
  if supported by the underlying OS. Otherwise no conversion is done
  and [;;4mLocaltime[0m is returned.

  For example:

    > erlang:localtime_to_universaltime({{1996,11,6},{14,45,17}}).
    {{1996,11,6},{13,45,17}}

  Failure: [;;4mbadarg[0m if [;;4mLocaltime[0m denotes an invalid date and time.
