You're seeing just the function to_string-exclamation-mark, go back to MyApp.Cldr.Time module for more information.
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to_string!(time, options \\ [])

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

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


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

  • options is a keyword list of options for formatting.


  • 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"


  • formatted_time_string or

  • raises an exception.


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

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

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

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

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

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