View Source Erlang Interop
erlang-dates-and-times
Erlang Dates and Times
how-to-work-with-erlang-datetime-and-time-representations
How to work with Erlang datetime and time representations
Without Timex, you've probably been working with Erlang's standard library :calendar module and/or :os.timestamp function, you may have code which already works on them, or need to consume them from another library, etc. The two most common representations of time in Erlang are the datetime and timestamp tuples, {{year, month, day}, {hour, minute, second}}, and {megaseconds, seconds, microseconds} respectively. The former is of course used for representing dates and times in a familiar format, the latter is used for representing precise moments in time, down to the microsecond.
converting-from-erlang-datetime-tuples
Converting from Erlang datetime tuples
# To bring the aliases for Timex's modules into scope, we need to "use" Timex
iex> use Timex
# Our input datetime
iex> date = :calendar.universal_time
{{2015, 6, 24}, {3, 59, 5}}
# Conversions to various Elixir types
iex> Timex.to_datetime(date, "Etc/UTC")
...
iex> Timex.to_naive_datetime(date)
...
iex> Timex.to_date(date)
...
converting-from-erlang-timestamp-tuples
Converting from Erlang timestamp tuples
# The simplest case, converting from a timestamp to a DateTime, using the highest precision
iex> Duration.from_erl(:os.timestamp())
#<Duration(P46Y6M24DT23H44M56.846453S)>
# Alternatively if you want control over the precision (in this example, we only care about up-to-the-second precision):
iex> time |> Duration.to_seconds |> Timex.from_unix
#<DateTime(2015-06-24T04:18:33Z Etc/UTC)>
converting-datetimes-to-erlang-datetime-tuples
Converting DateTimes to Erlang datetime tuples
Timex.to_erl/1 converts any valid Timex date/datetime to an erlang date or
datetime tuple.
iex> date = Timex.now
...> Timex.to_erl(date)
{{2015, 6, 24}, {4, 18, 33}}