View Source Cldr.Date.Interval (Cldr Dates & Times v2.17.0)

Interval formats allow for software to format intervals like "Jan 10-12, 2008" as a shorter and more natural format than "Jan 10, 2008 - Jan 12, 2008". They are designed to take a start and end date, time or datetime plus a formatting pattern and use that information to produce a localized format.

See Cldr.Interval.to_string/3 and Cldr.Date.Interval.to_string/3.

Summary

Functions

greatest_difference(from, to)

Returns the format code representing the date or time unit that is the greatest difference between two dates.

to_string(from, to, backend)

Returns a Date.Range or CalendarInterval as a localised string.

to_string(from, to, backend, options \\ [])

Returns a localised string representing the formatted interval formed by two dates.

to_string!(range, backend, options)

Returns a Date.Range or CalendarInterval as a localised string or raises an exception.

to_string!(from, to, backend, options \\ [])

Returns a localised string representing the formatted interval formed by two dates or raises an exception.

Functions

Link to this function

greatest_difference(from, to)

View Source

Returns the format code representing the date or time unit that is the greatest difference between two dates.

Arguments

Returns

  • {:ok, format_code} where format_code is one of

    • :y meaning that the greatest difference is in the year
    • :M meaning that the greatest difference is in the month
    • :d meaning that the greatest difference is in the day

  • {:error, :no_practical_difference}

Example 

iex> Cldr.Date.Interval.greatest_difference ~D[2022-04-22], ~D[2022-04-23]
{:ok, :d}

iex> Cldr.Date.Interval.greatest_difference ~D[2022-04-22], ~D[2022-04-22]
{:error, :no_practical_difference}
Link to this function

to_string(from, to, backend)

View Source 
@spec to_string(Cldr.Interval.range(), Cldr.backend(), Keyword.t()) ::
  {:ok, String.t()} | {:error, {module(), String.t()}}

Returns a Date.Range or CalendarInterval as a localised string.

Arguments

  • range is either a Date.Range.t returned from Date.range/2 or a CalendarInterval.t

  • backend is any module that includes use Cldr and is therefore a Cldr backend module.

  • options is a keyword list of options. The default is [format: :medium, style: :date].

Options

  • :format is one of :short, :medium or :long or a specific format type or a string representing of an interval format. The default is :medium.

  • :style supports dfferent formatting styles. The alternatives are :date, :month_and_day, :month and :year_and_month. The default is :date.

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

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

Returns

  • {:ok, string} or

  • {:error, {exception, reason}}

Notes

  • CalendarInterval support requires adding the dependency calendar_interval to the deps configuration in mix.exs.

  • For more information on interval format string see the Cldr.Interval.

  • The available predefined formats that can be applied are the keys of the map returned by Cldr.DateTime.Format.interval_formats(:en, :gregorian) where "en" can be replaced by any configured locale name and :gregorian is the underlying CLDR calendar type.

  • In the case where from and to are equal, a single date is formatted instead of an interval.

Examples 

iex> Cldr.Date.Interval.to_string Date.range(~D[2020-01-01], ~D[2020-12-31]), MyApp.Cldr
{:ok, "Jan 1 – Dec 31, 2020"}

iex> Cldr.Date.Interval.to_string Date.range(~D[2020-01-01], ~D[2020-01-12]), MyApp.Cldr
{:ok, "Jan 1 – 12, 2020"}

iex> Cldr.Date.Interval.to_string Date.range(~D[2020-01-01], ~D[2020-01-12]), MyApp.Cldr,
...> format: :long
{:ok, "Wed, Jan 1 – Sun, Jan 12, 2020"}

iex> Cldr.Date.Interval.to_string Date.range(~D[2020-01-01], ~D[2020-12-01]), MyApp.Cldr,
...> format: :long, style: :year_and_month
{:ok, "January – December 2020"}

iex> use CalendarInterval
iex> Cldr.Date.Interval.to_string ~I"2020-01/12", MyApp.Cldr
{:ok, "Jan 1 – Dec 31, 2020"}

iex> Cldr.Date.Interval.to_string Date.range(~D[2020-01-01], ~D[2020-01-12]), MyApp.Cldr,
...> format: :short
{:ok, "1/1/2020 – 1/12/2020"}

iex> Cldr.Date.Interval.to_string Date.range(~D[2020-01-01], ~D[2020-01-12]), MyApp.Cldr,
...> format: :long, locale: "fr"
{:ok, "mer. 1 – dim. 12 janv. 2020"}
Link to this function

to_string(from, to, backend, options \\ [])

View Source 
@spec to_string(
  Calendar.date() | nil,
  Calendar.date() | nil,
  Cldr.backend(),
  Keyword.t()
) ::
  {:ok, String.t()} | {:error, {module(), String.t()}}

Returns a localised string representing the formatted interval formed by two dates.

Arguments

  • from is any map that conforms to the Calendar.date type.

  • to is any map that conforms to the Calendar.date type. to must occur on or after from.

  • backend is any module that includes use Cldr and is therefore an Cldr backend module

  • options is a keyword list of options. The default is [format: :medium, style: :date].

Either from or to may also be nil in which case the interval is formatted as an open interval with the non-nil side formatted as a standalone date.

Options

  • :format is one of :short, :medium or :long or a specific format type or a string representing of an interval format. The default is :medium.

  • :style supports dfferent formatting styles. The alternatives are :date, :month_and_day, :month and :year_and_month. The default is :date.

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

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

Returns

  • {:ok, string} or

  • {:error, {exception, reason}}

Notes

  • For more information on interval format string see the Cldr.Interval.

  • The available predefined formats that can be applied are the keys of the map returned by Cldr.DateTime.Format.interval_formats(:en, :gregorian) where :en can be replaced by any configured locale name and :gregorian is the underlying CLDR calendar type.

  • In the case where from and to are equal, a single date is formatted instead of an interval.

Examples 

iex> Cldr.Date.Interval.to_string ~D[2020-01-01], ~D[2020-12-31], MyApp.Cldr
{:ok, "Jan 1 – Dec 31, 2020"}

iex> Cldr.Date.Interval.to_string ~D[2020-01-01], ~D[2020-01-12], MyApp.Cldr
{:ok, "Jan 1 – 12, 2020"}

iex> Cldr.Date.Interval.to_string ~D[2020-01-01], ~D[2020-01-12], MyApp.Cldr,
...> format: :long
{:ok, "Wed, Jan 1 – Sun, Jan 12, 2020"}

iex> Cldr.Date.Interval.to_string ~D[2020-01-01], ~D[2020-12-01], MyApp.Cldr,
...> format: :long, style: :year_and_month
{:ok, "January – December 2020"}

iex> Cldr.Date.Interval.to_string ~D[2020-01-01], ~D[2020-01-12], MyApp.Cldr,
...> format: :short
{:ok, "1/1/2020 – 1/12/2020"}

iex> Cldr.Date.Interval.to_string ~D[2020-01-01], nil, MyApp.Cldr,
...> format: :short
{:ok, "1/1/20 –"}

iex> Cldr.Date.Interval.to_string ~D[2020-01-01], ~D[2020-01-12], MyApp.Cldr,
...> format: :long, locale: "fr"
{:ok, "mer. 1 – dim. 12 janv. 2020"}

iex> Cldr.Date.Interval.to_string ~D[2020-01-01], ~D[2020-01-12], MyApp.Cldr,
...> format: :long, locale: "th", number_system: :thai
{:ok, "พ. ๑ ม.ค. – อา. ๑๒ ม.ค. ๒๐๒๐"}
Link to this function

to_string!(range, backend, options)

View Source 
@spec to_string!(Cldr.Interval.range(), Cldr.backend(), Keyword.t()) ::
  String.t() | no_return()

Returns a Date.Range or CalendarInterval as a localised string or raises an exception.

Arguments

  • range is either a Date.Range.t returned from Date.range/2 or a CalendarInterval.t

  • backend is any module that includes use Cldr and is therefore a Cldr backend module.

  • options is a keyword list of options. The default is [format: :medium, style: :date].

Options

  • :format is one of :short, :medium or :long or a specific format type or a string representing of an interval format. The default is :medium.

  • :style supports dfferent formatting styles. The alternatives are :date, :month_and_day, :month and :year_and_month. The default is :date.

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

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

Returns

  • string or

  • raises an exception

Notes

  • CalendarInterval support requires adding the dependency calendar_interval to the deps configuration in mix.exs.

  • For more information on interval format string see the Cldr.Interval.

  • The available predefined formats that can be applied are the keys of the map returned by Cldr.DateTime.Format.interval_formats(:en, :gregorian) where :en can be replaced by any configured locale name and :gregorian is the underlying CLDR calendar type.

  • In the case where from and to are equal, a single date is formatted instead of an interval.

Examples 

iex> Cldr.Date.Interval.to_string! Date.range(~D[2020-01-01], ~D[2020-12-31]), MyApp.Cldr
"Jan 1 – Dec 31, 2020"

iex> Cldr.Date.Interval.to_string! Date.range(~D[2020-01-01], ~D[2020-01-12]), MyApp.Cldr
"Jan 1 – 12, 2020"

iex> Cldr.Date.Interval.to_string! Date.range(~D[2020-01-01], ~D[2020-01-12]), MyApp.Cldr,
...> format: :long
"Wed, Jan 1 – Sun, Jan 12, 2020"

iex> Cldr.Date.Interval.to_string! Date.range(~D[2020-01-01], ~D[2020-12-01]), MyApp.Cldr,
...> format: :long, style: :year_and_month
"January – December 2020"

iex> use CalendarInterval
iex> Cldr.Date.Interval.to_string! ~I"2020-01/12", MyApp.Cldr
"Jan 1 – Dec 31, 2020"

iex> Cldr.Date.Interval.to_string! Date.range(~D[2020-01-01], ~D[2020-01-12]), MyApp.Cldr,
...> format: :short
"1/1/2020 – 1/12/2020"

iex> Cldr.Date.Interval.to_string! Date.range(~D[2020-01-01], ~D[2020-01-12]), MyApp.Cldr,
...> format: :long, locale: "fr"
"mer. 1 – dim. 12 janv. 2020"
Link to this function

to_string!(from, to, backend, options \\ [])

View Source 
@spec to_string!(
  Calendar.date() | nil,
  Calendar.date() | nil,
  Cldr.backend(),
  Keyword.t()
) ::
  String.t() | no_return()

Returns a localised string representing the formatted interval formed by two dates or raises an exception.

Arguments

  • from is any map that conforms to the Calendar.date type.

  • to is any map that conforms to the Calendar.date type. to must occur on or after from.

  • backend is any module that includes use Cldr and is therefore a Cldr backend module.

  • options is a keyword list of options. The default is [format: :medium, style: :date].

Options

  • :format is one of :short, :medium or :long or a specific format type or a string representing of an interval format. The default is :medium.

  • :style supports dfferent formatting styles. The alternatives are :date, :month_and_day, :month and :year_and_month. The default is :date.

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

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

Returns

  • string or

  • raises an exception

Notes

  • For more information on interval format string see Cldr.Interval.

  • The available predefined formats that can be applied are the keys of the map returned by Cldr.DateTime.Format.interval_formats(:en, :gregorian) where :en can be replaced by any configured locale name and :gregorian is the underlying CLDR calendar type.

  • In the case where from and to are equal, a single date is formatted instead of an interval.

Examples 

iex> Cldr.Date.Interval.to_string! ~D[2020-01-01], ~D[2020-12-31], MyApp.Cldr
"Jan 1 – Dec 31, 2020"

iex> Cldr.Date.Interval.to_string! ~D[2020-01-01], ~D[2020-01-12], MyApp.Cldr
"Jan 1 – 12, 2020"

iex> Cldr.Date.Interval.to_string! ~D[2020-01-01], ~D[2020-01-12], MyApp.Cldr,
...> format: :long
"Wed, Jan 1 – Sun, Jan 12, 2020"

iex> Cldr.Date.Interval.to_string! ~D[2020-01-01], ~D[2020-12-01], MyApp.Cldr,
...> format: :long, style: :year_and_month
"January – December 2020"

iex> Cldr.Date.Interval.to_string! ~D[2020-01-01], ~D[2020-01-12], MyApp.Cldr,
...> format: :short
"1/1/2020 – 1/12/2020"

iex> Cldr.Date.Interval.to_string! ~D[2020-01-01], ~D[2020-01-12], MyApp.Cldr,
...> format: :long, locale: "fr"
"mer. 1 – dim. 12 janv. 2020"

iex> Cldr.Date.Interval.to_string! ~D[2020-01-01], ~D[2020-01-12], MyApp.Cldr,
...> format: :long, locale: "th", number_system: :thai
"พ. ๑ ม.ค. – อา. ๑๒ ม.ค. ๒๐๒๐"