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Timex is a rich, comprehensive Date/Time library for Elixir projects, with full timezone support via the :tzdata package. If you need to manipulate dates, times, datetimes, timestamps, etc., then Timex is for you!
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lib/time/time.ex
defmodule Timex.Time do
@moduledoc """
This module provides helper functions for working with Times
"""
@doc """
Converts an hour between 0..24 to {1..12, :am/:pm}
## Examples
iex> Timex.Time.to_12hour_clock(23)
{11, :pm}
"""
@spec to_12hour_clock(0..24) :: {1..12, :am | :pm}
def to_12hour_clock(hour) when hour in 0..24 do
case hour do
hour when hour in [0, 24] -> {12, :am}
hour when hour < 12 -> {hour, :am}
hour when hour === 12 -> {12, :pm}
hour when hour > 12 -> {hour - 12, :pm}
end
end
@doc """
Converts an hour between 1..12 in either am or pm, to value between 0..24
## Examples
iex> Timex.Time.to_24hour_clock(7, :pm)
19
"""
@spec to_24hour_clock(1..12, :am | :pm) :: 0..23
def to_24hour_clock(hour, am_or_pm) when hour in 1..12 and am_or_pm in [:am, :pm] do
case am_or_pm do
:am when hour === 12 -> 0
:am -> hour
:pm when hour === 12 -> hour
:pm -> hour + 12
end
end
end