Daylight Savings Time

lib/icu/calendar.rb

@@ -72,6 +72,12 @@ def timezones
       end
     end
 
+    def daylight_time?
+      Library.assert_success do |status|
+        Library.ucal_inDaylightTime(@calendar, status)
+      end
+    end
+
     def initialize(timezone = nil, locale = nil)
       calendar = wchar_buffer_from_string_or_nil(timezone) do |timezone|
         Library.assert_success do |status|

spec/icu/calendar_spec.rb

@@ -168,6 +168,20 @@ def icu_version_at_least(version)
     end
   end
 
+  describe '#daylight_time?' do
+    subject(:calendar) { Calendar.new('US/Central') }
+
+    specify do
+      calendar.time = Time.new(2010, 5, 8)
+      expect(calendar).to be_daylight_time
+    end
+
+    specify do
+      calendar.time = Time.new(2012, 11, 15)
+      expect(calendar).to_not be_daylight_time
+    end
+  end
+
   describe '#locale' do
     it 'returns the locale' do
       expect(Calendar.new(nil, 'en_US').locale).to eq('en_US')