gigasecond

elixir/gigasecond/lib/gigasecond.ex

@@ -0,0 +1,17 @@
+defmodule Gigasecond do
+  @gigasecond 1_000_000_000
+
+  @doc """
+  Calculate a date one billion seconds after an input date.
+  """
+  @spec from({{pos_integer, pos_integer, pos_integer}, {pos_integer, pos_integer, pos_integer}}) ::
+          {{pos_integer, pos_integer, pos_integer}, {pos_integer, pos_integer, pos_integer}}
+  def from({{_year, _month, _day}, {_hours, _minutes, _seconds}} = erl_date_time) do
+    {:ok, from} =
+      NaiveDateTime.from_erl(erl_date_time)
+
+    from
+    |> NaiveDateTime.add(@gigasecond, :second)
+    |> NaiveDateTime.to_erl()
+  end
+end