Return the preferred time format for a locale.

Arguments

• language_tag is any language tag returned by Cldr.Locale.new/2 or any locale_name returned by Cldr.known_locale_names/1

Returns

• The hour format as an atom to be used for localization purposes. The return value is used as a function name in Cldr.DateTime.Formatter

Notes

• The hc key of the u extension is honoured and will override the default preferences for a locale or territory. See the last example below.

• Different locales and territories present the hour of day in different ways. These are represented in Cldr.DateTime.Formatter in the following way:

Examples

iex> Cldr.Time.hour_format_from_locale "en-AU"
:hour_1_12

iex> Cldr.Time.hour_format_from_locale "fr"
:hour_0_23

iex> Cldr.Time.hour_format_from_locale "fr-u-hc-h12"
:hour_1_12

Specs

to_string(map(), Cldr.backend() | Keyword.t(), Keyword.t()) ::
  {:ok, String.t()} | {:error, {module(), String.t()}}

Formats a time according to a format string as defined in CLDR and described in TR35

Returns

• {:ok, formatted_time} or

• {:error, reason}.

Arguments

• time is a %DateTime{} or %NaiveDateTime{} struct or any map that contains the keys hour, minute, second and optionally calendar and microsecond

• backend is any module that includes use Cldr and therefore is a Cldr backend module. The default is Cldr.default_backend/0.

• options is a keyword list of options for formatting.

Options

• format: :short | :medium | :long | :full or a format string. The default is :medium

• locale: any locale returned by Cldr.known_locale_names/1. The default is Cldr.get_locale()

• number_system: a number system into which the formatted date digits should be transliterated

• era: :variant will use a variant for the era is one is available in the locale. In the "en" locale, for example, era: :variant will return "BCE" instead of "BC".

• period: :variant will use a variant for the time period and flexible time period if one is available in the locale. For example, in the "en" locale period: :variant will return "pm" instead of "PM"

Examples

iex> Cldr.Time.to_string ~T[07:35:13.215217], MyApp.Cldr
{:ok, "7:35:13 AM"}

iex> Cldr.Time.to_string ~T[07:35:13.215217], MyApp.Cldr, format: :short
{:ok, "7:35 AM"}

iex> Cldr.Time.to_string ~T[07:35:13.215217], MyApp.Cldr, format: :medium, locale: "fr"
{:ok, "07:35:13"}

iex> Cldr.Time.to_string ~T[07:35:13.215217], MyApp.Cldr, format: :medium
{:ok, "7:35:13 AM"}

iex> {:ok, datetime} = DateTime.from_naive(~N[2000-01-01 23:59:59.0], "Etc/UTC")
iex> Cldr.Time.to_string datetime, MyApp.Cldr, format: :long
{:ok, "11:59:59 PM UTC"}

Specs

to_string!(map(), Cldr.backend() | Keyword.t(), Keyword.t()) ::
  String.t() | no_return()

Formats a time according to a format string as defined in CLDR and described in TR35.

Arguments

• time is a %DateTime{} or %NaiveDateTime{} struct or any map that contains the keys hour, minute, second and optionally calendar and microsecond

• backend is any module that includes use Cldr and therefore is a Cldr backend module. The default is Cldr.default_backend/0.

• options is a keyword list of options for formatting.

Options

• format: :short | :medium | :long | :full or a format string. The default is :medium

• locale is any valid locale name returned by Cldr.known_locale_names/0 or a Cldr.LanguageTag struct. The default is Cldr.get_locale/0

• number_system: a number system into which the formatted date digits should be transliterated

• era: :variant will use a variant for the era is one is available in the locale. In the "en" locale, for example, era: :variant will return "BCE" instead of "BC".

• period: :variant will use a variant for the time period and flexible time period if one is available in the locale. For example, in the "en" locale period: :variant will return "pm" instead of "PM"

Returns

• formatted_time_string or

• raises an exception.

Examples

iex> Cldr.Time.to_string! ~T[07:35:13.215217], MyApp.Cldr
"7:35:13 AM"

iex> Cldr.Time.to_string! ~T[07:35:13.215217], MyApp.Cldr, format: :short
"7:35 AM"

iex> Cldr.Time.to_string ~T[07:35:13.215217], MyApp.Cldr, format: :short, period: :variant
{:ok, "7:35 AM"}

iex> Cldr.Time.to_string! ~T[07:35:13.215217], MyApp.Cldr, format: :medium, locale: "fr"
"07:35:13"

iex> Cldr.Time.to_string! ~T[07:35:13.215217], MyApp.Cldr, format: :medium
"7:35:13 AM"

iex> {:ok, datetime} = DateTime.from_naive(~N[2000-01-01 23:59:59.0], "Etc/UTC")
iex> Cldr.Time.to_string! datetime, MyApp.Cldr, format: :long
"11:59:59 PM UTC"