Cldr.DateTime.to_string-exclamation-mark

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Link to this function

to_string!(datetime, backend \\ Cldr.Date.default_backend(), options \\ [])

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Specs

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

Formats a DateTime according to a format string as defined in CLDR and described in TR35 returning a formatted string or raising on error.

Arguments

  • datetime is a %DateTime{} or %NaiveDateTime{}struct or any map that contains the keys :year, :month, :day, :calendar. :hour, :minute and :second with optional :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 or any of the keys returned by Cldr.DateTime.available_format_names 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" for example, the locale 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_datetime or

  • raises an exception

Examples

iex> {:ok, datetime} = DateTime.from_naive(~N[2000-01-01 23:59:59.0], "Etc/UTC")
iex> Cldr.DateTime.to_string! datetime, MyApp.Cldr, locale: "en"
"Jan 1, 2000, 11:59:59 PM"
iex> Cldr.DateTime.to_string! datetime, MyApp.Cldr, format: :long, locale: "en"
"January 1, 2000 at 11:59:59 PM UTC"
iex> Cldr.DateTime.to_string! datetime, MyApp.Cldr, format: :full, locale: "en"
"Saturday, January 1, 2000 at 11:59:59 PM GMT"
iex> Cldr.DateTime.to_string! datetime, MyApp.Cldr, format: :full, locale: "fr"
"samedi 1 janvier 2000 à 23:59:59 UTC"