Time.local instances: Adding 24.hours across the DST boundary adds 24 hours instead of one day [rails#2066 state:resolved]

Author: mcurtis

activesupport/CHANGELOG

@@ -1,3 +1,8 @@
+*Edge
+
+* Time.local instances: Adding 24.hours across the DST boundary adds 24 hours instead of one day #2066 [Michael Curtis]
+
+
 *2.3.2 [Final] (March 15, 2009)*
 
 * XmlMini supports LibXML and Nokogiri backends.  #2084, #2190 [Bart ten Brinke, Aaron Patterson]

activesupport/lib/active_support/core_ext/time/calculations.rb

@@ -116,22 +116,14 @@ def advance(options)
           seconds_to_advance == 0 ? time_advanced_by_date : time_advanced_by_date.since(seconds_to_advance)
         end
 
-        # Returns a new Time representing the time a number of seconds ago, this is basically a wrapper around the Numeric extension
+        # Returns a new Time representing the time a number of seconds ago
         def ago(seconds)
           self.since(-seconds)
         end
 
-        # Returns a new Time representing the time a number of seconds since the instance time, this is basically a wrapper around
-        # the Numeric extension.
+        # Returns a new Time representing the time a number of seconds since the instance time
         def since(seconds)
-          f = seconds.since(self)
-          if ActiveSupport::Duration === seconds
-            f
-          else
-            initial_dst = self.dst? ? 1 : 0
-            final_dst   = f.dst? ? 1 : 0
-            (seconds.abs >= 86400 && initial_dst != final_dst) ? f + (initial_dst - final_dst).hours : f
-          end
+          self + seconds
         rescue
           self.to_datetime.since(seconds)
         end

activesupport/test/core_ext/duration_test.rb

@@ -109,6 +109,18 @@ def test_since_and_ago_anchored_to_time_zone_now_when_time_zone_default_set
   ensure
     Time.zone_default = nil
   end
+  
+  def test_adding_hours_across_dst_boundary
+    with_env_tz 'CET' do
+      assert_equal Time.local(2009,3,29,0,0,0) + 24.hours, Time.local(2009,3,30,1,0,0)
+    end
+  end
+  
+  def test_adding_day_across_dst_boundary
+    with_env_tz 'CET' do
+      assert_equal Time.local(2009,3,29,0,0,0) + 1.day, Time.local(2009,3,30,0,0,0)
+    end
+  end
 
   protected
     def with_env_tz(new_tz = 'US/Eastern')

activesupport/test/core_ext/time_ext_test.rb

@@ -183,26 +183,26 @@ def test_ago
   def test_daylight_savings_time_crossings_backward_start
     with_env_tz 'US/Eastern' do
       # dt: US: 2005 April 3rd 4:18am
-      assert_equal Time.local(2005,4,2,4,18,0), Time.local(2005,4,3,4,18,0).ago(86400), 'dt-1.day=>st'
-      assert_equal Time.local(2005,4,1,4,18,0), Time.local(2005,4,2,4,18,0).ago(86400), 'st-1.day=>st'
+      assert_equal Time.local(2005,4,2,3,18,0), Time.local(2005,4,3,4,18,0).ago(24.hours), 'dt-1.day=>st'
+      assert_equal Time.local(2005,4,1,4,18,0), Time.local(2005,4,2,4,18,0).ago(24.hours), 'st-1.day=>st'
     end
     with_env_tz 'NZ' do
       # dt: New Zealand: 2006 October 1st 4:18am
-      assert_equal Time.local(2006,9,30,4,18,0), Time.local(2006,10,1,4,18,0).ago(86400), 'dt-1.day=>st'
-      assert_equal Time.local(2006,9,29,4,18,0), Time.local(2006,9,30,4,18,0).ago(86400), 'st-1.day=>st'
+      assert_equal Time.local(2006,9,30,3,18,0), Time.local(2006,10,1,4,18,0).ago(24.hours), 'dt-1.day=>st'
+      assert_equal Time.local(2006,9,29,4,18,0), Time.local(2006,9,30,4,18,0).ago(24.hours), 'st-1.day=>st'
     end
   end
 
   def test_daylight_savings_time_crossings_backward_end
     with_env_tz 'US/Eastern' do
       # st: US: 2005 October 30th 4:03am
-      assert_equal Time.local(2005,10,29,4,3), Time.local(2005,10,30,4,3,0).ago(86400), 'st-1.day=>dt'
-      assert_equal Time.local(2005,10,28,4,3), Time.local(2005,10,29,4,3,0).ago(86400), 'dt-1.day=>dt'
+      assert_equal Time.local(2005,10,29,5,3), Time.local(2005,10,30,4,3,0).ago(24.hours), 'st-1.day=>dt'
+      assert_equal Time.local(2005,10,28,4,3), Time.local(2005,10,29,4,3,0).ago(24.hours), 'dt-1.day=>dt'
     end
     with_env_tz 'NZ' do
       # st: New Zealand: 2006 March 19th 4:03am
-      assert_equal Time.local(2006,3,18,4,3), Time.local(2006,3,19,4,3,0).ago(86400), 'st-1.day=>dt'
-      assert_equal Time.local(2006,3,17,4,3), Time.local(2006,3,18,4,3,0).ago(86400), 'dt-1.day=>dt'
+      assert_equal Time.local(2006,3,18,5,3), Time.local(2006,3,19,4,3,0).ago(24.hours), 'st-1.day=>dt'
+      assert_equal Time.local(2006,3,17,4,3), Time.local(2006,3,18,4,3,0).ago(24.hours), 'dt-1.day=>dt'
     end
   end
 
@@ -243,13 +243,13 @@ def test_since
   def test_daylight_savings_time_crossings_forward_start
     with_env_tz 'US/Eastern' do
       # st: US: 2005 April 2nd 7:27pm
-      assert_equal Time.local(2005,4,3,19,27,0), Time.local(2005,4,2,19,27,0).since(86400), 'st+1.day=>dt'
-      assert_equal Time.local(2005,4,4,19,27,0), Time.local(2005,4,3,19,27,0).since(86400), 'dt+1.day=>dt'
+      assert_equal Time.local(2005,4,3,20,27,0), Time.local(2005,4,2,19,27,0).since(24.hours), 'st+1.day=>dt'
+      assert_equal Time.local(2005,4,4,19,27,0), Time.local(2005,4,3,19,27,0).since(24.hours), 'dt+1.day=>dt'
     end
     with_env_tz 'NZ' do
       # st: New Zealand: 2006 September 30th 7:27pm
-      assert_equal Time.local(2006,10,1,19,27,0), Time.local(2006,9,30,19,27,0).since(86400), 'st+1.day=>dt'
-      assert_equal Time.local(2006,10,2,19,27,0), Time.local(2006,10,1,19,27,0).since(86400), 'dt+1.day=>dt'
+      assert_equal Time.local(2006,10,1,20,27,0), Time.local(2006,9,30,19,27,0).since(24.hours), 'st+1.day=>dt'
+      assert_equal Time.local(2006,10,2,19,27,0), Time.local(2006,10,1,19,27,0).since(24.hours), 'dt+1.day=>dt'
     end
   end
 
@@ -295,13 +295,13 @@ def test_daylight_savings_time_crossings_backward_start_yesterday
   def test_daylight_savings_time_crossings_forward_end
     with_env_tz 'US/Eastern' do
       # dt: US: 2005 October 30th 12:45am
-      assert_equal Time.local(2005,10,31,0,45,0), Time.local(2005,10,30,0,45,0).since(86400), 'dt+1.day=>st'
-      assert_equal Time.local(2005,11, 1,0,45,0), Time.local(2005,10,31,0,45,0).since(86400), 'st+1.day=>st'
+      assert_equal Time.local(2005,10,30,23,45,0), Time.local(2005,10,30,0,45,0).since(24.hours), 'dt+1.day=>st'
+      assert_equal Time.local(2005,11, 1,0,45,0), Time.local(2005,10,31,0,45,0).since(24.hours), 'st+1.day=>st'
     end
     with_env_tz 'NZ' do
       # dt: New Zealand: 2006 March 19th 1:45am
-      assert_equal Time.local(2006,3,20,1,45,0), Time.local(2006,3,19,1,45,0).since(86400), 'dt+1.day=>st'
-      assert_equal Time.local(2006,3,21,1,45,0), Time.local(2006,3,20,1,45,0).since(86400), 'st+1.day=>st'
+      assert_equal Time.local(2006,3,20,0,45,0), Time.local(2006,3,19,1,45,0).since(24.hours), 'dt+1.day=>st'
+      assert_equal Time.local(2006,3,21,1,45,0), Time.local(2006,3,20,1,45,0).since(24.hours), 'st+1.day=>st'
     end
   end