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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/parse/datetime/helpers.ex
defmodule Timex.Parse.DateTime.Helpers do
@moduledoc false
import Combine.Parsers.Base
import Combine.Parsers.Text
@weekdays_abbr ["mon", "tue", "wed", "thu", "fri", "sat", "sun"]
@weekdays ["monday", "tuesday", "wednesday", "thursday", "friday", "saturday", "sunday"]
@months [
"January", "February", "March", "April",
"May", "June", "July", "August",
"September", "October", "November", "December"
]
def months, do: @months
def to_month(month) when is_integer(month), do: [month: month]
def to_month_num(nil), do: fail("Invalid month value.")
def to_month_num(m) when m in ["January", "Jan"], do: to_month(1)
def to_month_num(m) when m in ["February", "Feb"], do: to_month(2)
def to_month_num(m) when m in ["March", "Mar"], do: to_month(3)
def to_month_num(m) when m in ["April", "Apr"], do: to_month(4)
def to_month_num(m) when m in ["May", "May"], do: to_month(5)
def to_month_num(m) when m in ["June", "Jun"], do: to_month(6)
def to_month_num(m) when m in ["July", "Jul"], do: to_month(7)
def to_month_num(m) when m in ["August", "Aug"], do: to_month(8)
def to_month_num(m) when m in ["September", "Sep"], do: to_month(9)
def to_month_num(m) when m in ["October", "Oct"], do: to_month(10)
def to_month_num(m) when m in ["November", "Nov"], do: to_month(11)
def to_month_num(m) when m in ["December", "Dec"], do: to_month(12)
def is_weekday(name) do
n = String.downcase(name)
cond do
n in @weekdays_abbr -> true
n in @weekdays -> true
true -> false
end
end
def to_weekday(name) do
n = String.downcase(name)
case n do
n when n in ["mon", "monday"] -> 1
n when n in ["tue", "tuesday"] -> 2
n when n in ["wed", "wednesday"] -> 3
n when n in ["thu", "thursday"] -> 4
n when n in ["fri", "friday"] -> 5
n when n in ["sat", "saturday"] -> 6
n when n in ["sun", "sunday"] -> 7
end
end
def to_sec_ms(sec, fraction) do
{n, _} = Float.parse("0.#{fraction}")
[sec: sec, sec_fractional: (1_000*n) |> Float.round |> trunc]
end
def to_ampm("am"), do: [am: "am"]
def to_ampm("AM"), do: [AM: "AM"]
def to_ampm("pm"), do: [am: "pm"]
def to_ampm("PM"), do: [AM: "PM"]
def integer4(opts \\ []) do
case get_in(opts, [:padding]) do
:zeroes ->
choice([
pair_right(string("000"), fixed_integer(1)),
pair_right(string("00"), fixed_integer(2)),
pair_right(char("0"), fixed_integer(3)),
fixed_integer(4),
])
:spaces ->
choice([
pair_right(string(" "), fixed_integer(1)),
pair_right(string(" "), fixed_integer(2)),
pair_right(char(" "), fixed_integer(3)),
fixed_integer(4),
])
_ ->
choice([
fixed_integer(4),
fixed_integer(3),
fixed_integer(2),
fixed_integer(1)
])
end
end
def integer3(opts \\ []) do
case get_in(opts, [:padding]) do
:zeroes -> choice([
pair_right(string("00"), fixed_integer(1)),
pair_right(char("0"), fixed_integer(2)),
fixed_integer(3)
])
:spaces -> choice([
pair_right(string(" "), fixed_integer(1)),
pair_right(char(" "), fixed_integer(2)),
fixed_integer(3)
])
_ -> choice([
fixed_integer(3), fixed_integer(2), fixed_integer(1)
])
end
end
def integer2(opts \\ []) do
case get_in(opts, [:padding]) do
:zeroes -> choice([pair_right(char("0"), fixed_integer(1)), fixed_integer(2)])
:spaces -> choice([pair_right(char(" "), fixed_integer(1)), fixed_integer(2)])
_ -> choice([fixed_integer(2), fixed_integer(1)])
end
end
end