Packages
timex
3.4.2
3.7.13
3.7.12
3.7.11
3.7.9
3.7.8
3.7.7
3.7.6
3.7.5
3.7.3
3.7.2
3.7.1
3.7.0
3.6.4
3.6.3
3.6.2
retired
3.6.1
3.6.0
3.5.0
3.4.2
3.4.1
3.3.0
3.2.2
3.2.1
3.2.0
3.1.25
retired
3.1.24
3.1.23
3.1.22
3.1.21
3.1.20
3.1.19
3.1.18
3.1.17
3.1.16
3.1.15
3.1.13
3.1.12
3.1.11
3.1.10
3.1.9
3.1.8
3.1.7
3.1.6
3.1.5
3.1.4
3.1.3
3.1.2
3.1.1
3.1.0
3.0.8
3.0.7
3.0.6
3.0.5
3.0.4
3.0.3
3.0.2
3.0.1
3.0.0
2.2.1
2.1.6
2.1.5
2.1.4
2.1.3
2.1.2
2.1.1
2.1.0
2.0.0
1.0.2
1.0.1
1.0.0
1.0.0-rc4
1.0.0-rc3
1.0.0-rc2
1.0.0-rc1
1.0.0-pre
0.19.5
0.19.4
0.19.3
0.19.2
0.19.1
0.19.0
0.18.2
0.18.1
0.18.0
0.17.0
0.16.2
0.16.1
0.16.0
0.15.0
0.14.3
0.14.2
0.14.1
0.14.0
0.13.5
0.13.4
0.13.3
0.13.2
0.13.1
0.13.0
0.12.9
0.12.8
0.12.7
0.12.6
0.12.5
0.12.4
0.12.3
0.12.2
0.12.1
0.12.0
0.11.0
0.10.2
0.10.1
0.10.0
0.9.0
0.8.0
0.7.1
0.6.0
0.5.0
0.4.8
0.4.7
0.4.6
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/datetime/helpers.ex
defmodule Timex.DateTime.Helpers do
@moduledoc false
alias Timex.{Types, Timezone, TimezoneInfo, AmbiguousDateTime, AmbiguousTimezoneInfo}
@doc """
Constructs an empty DateTime, for internal use only
"""
def empty() do
%DateTime{year: 0, month: 1, day: 1,
hour: 0, minute: 0, second: 0,
microsecond: {0,0},
time_zone: nil,
zone_abbr: nil,
utc_offset: 0, std_offset: 0}
end
@doc """
Constructs a DateTime from an Erlang date or datetime tuple and a timezone.
Intended for internal use only.
"""
@spec construct(Types.date, Types.valid_timezone) :: DateTime.t | AmbiguousDateTime.t | {:error, term}
@spec construct(Types.datetime, Types.valid_timezone) :: DateTime.t | AmbiguousDateTime.t | {:error, term}
@spec construct(Types.microsecond_datetime, Types.valid_timezone) :: DateTime.t | AmbiguousDateTime.t | {:error, term}
def construct({_, _, _} = date, timezone) do
construct({date, {0,0,0,0}}, timezone)
end
def construct({{_,_,_} = date, {h,mm,s}}, timezone) do
construct({date,{h,mm,s,0}}, timezone)
end
def construct({{y,m,d} = date, {h,mm,s,us}}, timezone) do
seconds_from_zeroyear = :calendar.datetime_to_gregorian_seconds({date,{h,mm,s}})
case Timezone.name_of(timezone) do
{:error, _} = err ->
err
tzname ->
case Timezone.resolve(tzname, seconds_from_zeroyear) do
{:error, _} = err ->
err
%TimezoneInfo{} = tz ->
%DateTime{:year => y, :month => m, :day => d,
:hour => h, :minute => mm, :second => s,
:microsecond => construct_microseconds(us),
:time_zone => tz.full_name, :zone_abbr => tz.abbreviation,
:utc_offset => tz.offset_utc, :std_offset => tz.offset_std}
%AmbiguousTimezoneInfo{before: b, after: a} ->
bd = %DateTime{:year => y, :month => m, :day => d,
:hour => h, :minute => mm, :second => s,
:microsecond => construct_microseconds(us),
:time_zone => b.full_name, :zone_abbr => b.abbreviation,
:utc_offset => b.offset_utc, :std_offset => b.offset_std}
ad = %DateTime{:year => y, :month => m, :day => d,
:hour => h, :minute => mm, :second => s,
:microsecond => construct_microseconds(us),
:time_zone => a.full_name, :zone_abbr => a.abbreviation,
:utc_offset => a.offset_utc, :std_offset => a.offset_std}
%AmbiguousDateTime{before: bd, after: ad}
end
end
end
def construct_microseconds({us, p} = us_tuple) when is_integer(us) and is_integer(p), do: us_tuple
def construct_microseconds(0), do: {0,0}
def construct_microseconds(n), do: {n, precision(n)}
defp precision(0), do: 0
defp precision(n) when is_integer(n) do
ns = Integer.to_string(n)
n_width = byte_size(ns)
trimmed = byte_size(String.trim_trailing(ns, "0"))
p = 6 - (n_width - trimmed)
if p > 6, do: 6, else: p
end
end