Fix time intervals formatting when the interval crosses midnight. Closes

 #46

CHANGELOG.md

@@ -2,6 +2,14 @@
 
 **Note that `ex_cldr_dates_times` version 2.14.0 and later are supported on Elixir 1.11 and later only.**
 
+## Cldr_Dates_Times v2.15.1
+
+This is the changelog for Cldr_Dates_Times v2.15.1 released on October 22nd, 2023.  For older changelogs please consult the release tag on [GitHub](https://github.com/elixir-cldr/cldr_cldr_dates_times/tags)
+
+### Bug Fixes
+
+* Fix formatting time intervals when the `to` time is not greater than the `from` time. This allows time intervals that cross midnight to be formatted correctly. Thanks to @larshei  for the report. Closes #42.
+
 ## Cldr_Dates_Times v2.15.0
 
 This is the changelog for Cldr_Dates_Times v2.15.0 released on October 17th, 2023.  For older changelogs please consult the release tag on [GitHub](https://github.com/elixir-cldr/cldr_cldr_dates_times/tags)

lib/cldr/interval/time.ex

@@ -246,8 +246,7 @@ defmodule Cldr.Time.Interval do
       |> Keyword.put(:locale, locale)
       |> Keyword.put(:number_system, number_system)
 
-    with {:ok, _} <- from_less_than_or_equal_to(from, to),
-         {:ok, backend} <- Cldr.validate_backend(backend),
+    with {:ok, backend} <- Cldr.validate_backend(backend),
          {:ok, locale} <- Cldr.validate_locale(locale, backend),
          {:ok, _} <- Cldr.Number.validate_number_system(locale, number_system, backend),
          {:ok, calendar} <- Cldr.Calendar.validate_calendar(from.calendar),
@@ -313,8 +312,7 @@ defmodule Cldr.Time.Interval do
     `Calendar.time` type.
 
   * `to` is any map that conforms to the
-    `Calendar.time` type. `to` must occur
-    on or after `from`.
+    `Calendar.time` type.
 
   * `backend` is any module that includes `use Cldr` and
     is therefore `Cldr` backend module
@@ -368,6 +366,9 @@ defmodule Cldr.Time.Interval do
       iex> Cldr.Time.Interval.to_string! ~T[10:00:00], ~T[10:03:00], MyApp.Cldr, format: :long
       "10:00 – 10:03 AM"
 
+      iex> Cldr.Time.Interval.to_string ~T[23:00:00.0Z], ~T[01:01:00.0Z], MyApp.Cldr
+      {:ok, "11:00 PM – 1:01 AM"}
+
       iex> Cldr.Time.Interval.to_string! ~T[10:00:00], ~T[10:03:00], MyApp.Cldr,
       ...> format: :long, style: :flex
       "10:00 – 10:03 in the morning"
@@ -427,12 +428,12 @@ defmodule Cldr.Time.Interval do
     Cldr.Date.Interval.greatest_difference(from, to)
   end
 
-  defp from_less_than_or_equal_to(from, to) do
-    case Time.compare(from, to) do
-      comp when comp in [:eq, :lt] -> {:ok, comp}
-      _other -> {:error, Cldr.Date.Interval.datetime_order_error(from, to)}
-    end
-  end
+  # defp from_less_than_or_equal_to(from, to) do
+  #   case Time.compare(from, to) do
+  #     comp when comp in [:eq, :lt] -> {:ok, comp}
+  #     _other -> {:error, Cldr.Date.Interval.datetime_order_error(from, to)}
+  #   end
+  # end
 
   defp resolve_format(from, to, formats, locale, options) do
     format = Keyword.get(options, :format, @default_format)
@@ -450,7 +451,7 @@ defmodule Cldr.Time.Interval do
   end
 
   defp greatest_difference_format(%{hour: from}, %{hour: to}, format, :H)
-       when from < 12 and to >= 12 do
+       when (from < 12 and to >= 12) or (from >= 12 and to < 12) do
     case Map.get(format, :b) || Map.get(format, :a) || Map.get(format, :H) || Map.get(format, :h) do
       nil -> {:error, format_error(format, format)}
       success -> {:ok, success}

mix.exs

@@ -1,7 +1,7 @@
 defmodule Cldr.DatesTimes.Mixfile do
   use Mix.Project
 
-  @version "2.15.0"
+  @version "2.15.1"
 
   def project do
     [