Time#since overflows to DateTime. Introduce Time#to_datetime. Closes #7715.

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@6335 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activesupport/CHANGELOG

@@ -1,6 +1,6 @@
 *SVN*
 
-* Out-of-range Time calculations transparently overflow to DateTime.  #7706 [Geoff Buesing]
+* Out-of-range Time calculations transparently overflow to DateTime. Introduce Time#to_datetime.  #7706, #7715 [Geoff Buesing]
 
 * DateTime calculations analogous to the Date and Time extensions.  #7693 [Geoff Buesing]
 

activesupport/lib/active_support/core_ext/date_time/conversions.rb

@@ -22,6 +22,11 @@ module ActiveSupport #:nodoc:
         def to_date
           ::Date.new(year, month, day)
         end
+        
+        # To be able to keep Times and DateTimes interchangeable on conversions
+        def to_datetime
+          self
+        end        
       end
     end
   end

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

@@ -91,6 +91,8 @@ module ActiveSupport #:nodoc:
           f = seconds.since(self)
           final_dst   = f.dst? ? 1 : 0
           (seconds.abs >= 86400 && initial_dst != final_dst) ? f + (initial_dst - final_dst).hours : f
+        rescue
+          self.to_datetime.since(seconds)          
         end
         alias :in :since
 

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

@@ -28,6 +28,11 @@ module ActiveSupport #:nodoc:
         def to_time
           self
         end
+        
+        # converts to a Ruby DateTime instance; preserves utc offset
+        def to_datetime
+          ::DateTime.civil(year, month, day, hour, min, sec, Rational(utc_offset, 86400), 0)
+        end        
       end
     end
   end

activesupport/test/core_ext/time_ext_test.rb

@@ -167,6 +167,8 @@ class TimeExtCalculationsTest < Test::Unit::TestCase
     assert_equal Time.local(2005,2,22,11,10,10), Time.local(2005,2,22,10,10,10).since(3600)
     assert_equal Time.local(2005,2,24,10,10,10), Time.local(2005,2,22,10,10,10).since(86400*2)
     assert_equal Time.local(2005,2,24,11,10,35), Time.local(2005,2,22,10,10,10).since(86400*2 + 3600 + 25)
+    # when out of range of Time, returns a DateTime
+    assert_equal DateTime.civil(2038,1,20,11,59,59), Time.utc(2038,1,18,11,59,59).since(86400*2)
   end
 
   def test_daylight_savings_time_crossings_forward_start
@@ -351,6 +353,16 @@ class TimeExtCalculationsTest < Test::Unit::TestCase
     assert_nothing_raised { Time.now.xmlschema }
   end
 
+  def test_to_datetime
+    assert_equal Time.utc(2005, 2, 21, 17, 44, 30).to_datetime, DateTime.civil(2005, 2, 21, 17, 44, 30, 0, 0)
+    with_timezone 'US/Eastern' do
+      assert_equal Time.local(2005, 2, 21, 17, 44, 30).to_datetime, DateTime.civil(2005, 2, 21, 17, 44, 30, DateTime.now.offset, 0)
+    end
+    with_timezone 'NZ' do
+      assert_equal Time.local(2005, 2, 21, 17, 44, 30).to_datetime, DateTime.civil(2005, 2, 21, 17, 44, 30, DateTime.now.offset, 0)
+    end    
+  end
+
   protected
     def with_timezone new_tz='US/Eastern'
       old_tz, ENV['TZ'] = ENV['TZ'], new_tz