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lib/good_times.ex

defmodule GoodTimes do
def now, do: :calendar.universal_time
def seconds_from_now(seconds) do
now
|> :calendar.datetime_to_gregorian_seconds
|> Kernel.+(seconds)
|> :calendar.gregorian_seconds_to_datetime
end
def seconds_ago(seconds), do: seconds_from_now(-seconds)
end