Time.zone.parse: compatibility with far future date with time zone offset in string. Eliminate creation of additional TimeWithZone instance to determine utc offset.

activesupport/lib/active_support/values/time_zone.rb

@@ -214,10 +214,11 @@ class TimeZone
   #   Time.zone.parse('22:30:00')   # => Fri, 31 Dec 1999 22:30:00 HST -10:00
   def parse(str, now=now)
     time = Time.parse(str, now) rescue DateTime.parse(str)
-    unless time.is_a?(DateTime) || Date._parse(str)[:offset].nil?
-      time += time.in_time_zone(self).utc_offset - time.utc_offset
+    if Date._parse(str)[:offset].nil?
+      ActiveSupport::TimeWithZone.new(nil, self, time)
+    else
+      time.in_time_zone(self)
     end
-    ActiveSupport::TimeWithZone.new(nil, self, time)
   end
 
   # Returns an ActiveSupport::TimeWithZone instance representing the current time

activesupport/test/time_zone_test.rb

@@ -189,6 +189,15 @@ class TimeZoneTest < Test::Unit::TestCase
       assert_equal zone, twz.time_zone
     end
   end
+  
+  def test_parse_far_future_date_with_time_zone_offset_in_string
+    silence_warnings do # silence warnings raised by tzinfo gem
+      zone = TimeZone['Eastern Time (US & Canada)']
+      twz = zone.parse('2050-12-31 19:00:00 -10:00') # i.e., 2050-01-01 05:00:00 UTC
+      assert_equal [0,0,0,1,1,2051], twz.to_a[0,6]
+      assert_equal zone, twz.time_zone
+    end
+  end
 
   uses_mocha 'TestParseWithIncompleteDate' do
     def test_parse_with_incomplete_date