ElixirでMySQLのdatetime型をUNIX TIMESTAMPに変換する ref: http://qiita.com/AKB428/items/1e6491b4badcf416d9be

file0.txt

defmodule UnixTime do
  def convert_date_to_unixtime(created_at) do
    #JSTの場合9Hにしておく
    epoch = {{1970, 1, 1}, {9, 0, 0}}
    epoch_gs = :calendar.datetime_to_gregorian_seconds(epoch)

    {{year, month, day}, {hour, minute, second, msec}} = created_at
    gs = :calendar.datetime_to_gregorian_seconds({{year, month, day}, {hour, minute, second}})
    gs - epoch_gs
  end
end

file1.txt

UnixTime.convert_date_to_unixtime(updated_at)