1 files changed, 34 insertions, 0 deletions
diff --git a/app/helpers/time_zone_helper.rb b/app/helpers/time_zone_helper.rb
new file mode 100644
index 00000000000..00f65b72c8e
--- /dev/null
+++ b/app/helpers/time_zone_helper.rb
@@ -0,0 +1,34 @@
+# frozen_string_literal: true
+
+module TimeZoneHelper
+  TIME_ZONE_FORMAT_ATTRS = {
+    short: %i[identifier name offset],
+    full: %i[identifier name abbr offset formatted_offset]
+  }.freeze
+  private_constant :TIME_ZONE_FORMAT_ATTRS
+
+  # format:
+  #   * :full - all available fields
+  #   * :short (default)
+  #
+  # Example:
+  #   timezone_data # :short by default
+  #   timezone_data(format: :full)
+  #
+  def timezone_data(format: :short)
+    attrs = TIME_ZONE_FORMAT_ATTRS.fetch(format) do
+      valid_formats = TIME_ZONE_FORMAT_ATTRS.keys.map { |k| ":#{k}"}.join(", ")
+      raise ArgumentError.new("Invalid format :#{format}. Valid formats are #{valid_formats}.")
+    end
+
+    ActiveSupport::TimeZone.all.map do |timezone|
+      {
+        identifier: timezone.tzinfo.identifier,
+        name: timezone.name,
+        abbr: timezone.tzinfo.strftime('%Z'),
+        offset: timezone.now.utc_offset,
+        formatted_offset: timezone.now.formatted_offset
+      }.slice(*attrs)
+    end
+  end
+end