diff --git a/activesupport/CHANGELOG.md b/activesupport/CHANGELOG.md
index daa283e397b51dea67330833479355d8b9d40038..df8cf5f8ecb83e3f00d529c9a6e31abd3079b231 100644
--- a/activesupport/CHANGELOG.md
+++ b/activesupport/CHANGELOG.md
@@ -1,5 +1,9 @@
 ## Rails 4.0.0 (unreleased) ##
 
+*   Added beginning_of_minute support to core_ext calculations for Time and DateTime
+
+    *Gagan Awhad*
+
 *   Add `:nsec` date format.
 
     *Jamie Gaskins*
diff --git a/activesupport/lib/active_support/core_ext/date_time/calculations.rb b/activesupport/lib/active_support/core_ext/date_time/calculations.rb
index 1d3682eaf251f48353e91ff936184da26995dd1c..82cc46aa37da2748ea330c6f13e5b2cdb237663c 100644
--- a/activesupport/lib/active_support/core_ext/date_time/calculations.rb
+++ b/activesupport/lib/active_support/core_ext/date_time/calculations.rb
@@ -123,6 +123,18 @@ def end_of_hour
     change(:min => 59, :sec => 59)
   end
   alias :at_end_of_hour :end_of_hour
+  
+  # Returns a new DateTime representing the start of the hour (hh:mm:00).
+  def beginning_of_minute
+    change(:sec => 0)
+  end
+  alias :at_beginning_of_minute :beginning_of_minute
+
+  # Returns a new DateTime representing the end of the minute (hh:mm:59).
+  def end_of_minute
+    change(:sec => 59)
+  end
+  alias :at_end_of_minute :end_of_minute
 
   # Adjusts DateTime to UTC by adding its offset value; offset is set to 0.
   #
diff --git a/activesupport/lib/active_support/core_ext/time/calculations.rb b/activesupport/lib/active_support/core_ext/time/calculations.rb
index 1f95f622295fb1791f309adfd633ecca94f2dc7c..c18169fab50bcd1f050329fc22d913179cb37186 100644
--- a/activesupport/lib/active_support/core_ext/time/calculations.rb
+++ b/activesupport/lib/active_support/core_ext/time/calculations.rb
@@ -188,6 +188,21 @@ def end_of_hour
   end
   alias :at_end_of_hour :end_of_hour
 
+  # Returns a new Time representing the start of the hour (x:xx:00)
+  def beginning_of_minute
+    change(:sec => 0)
+  end
+  alias :at_beginning_of_minute :beginning_of_minute
+
+  # Returns a new Time representing the end of the hour, x:59:59.999999 (.999999999 in ruby1.9)
+  def end_of_minute
+    change(
+      :sec => 59,
+      :usec => Rational(999999999, 1000)
+    )
+  end
+  alias :at_end_of_minute :end_of_minute
+
   # Returns a Range representing the whole day of the current time.
   def all_day
     beginning_of_day..end_of_day
diff --git a/activesupport/test/core_ext/date_time_ext_test.rb b/activesupport/test/core_ext/date_time_ext_test.rb
index 24e62cc2b9e18822fe87e18c73986956d3ea59e7..59ca2a4059c68c3edd07ea6f147a1fc814145638 100644
--- a/activesupport/test/core_ext/date_time_ext_test.rb
+++ b/activesupport/test/core_ext/date_time_ext_test.rb
@@ -88,6 +88,14 @@ def test_end_of_hour
     assert_equal DateTime.civil(2005,2,4,19,59,59), DateTime.civil(2005,2,4,19,30,10).end_of_hour
   end
 
+  def test_beginning_of_minute
+    assert_equal DateTime.civil(2005,2,4,19,30,0), DateTime.civil(2005,2,4,19,30,10).beginning_of_minute
+  end
+
+  def test_end_of_minute
+    assert_equal DateTime.civil(2005,2,4,19,30,59), DateTime.civil(2005,2,4,19,30,10).end_of_minute
+  end
+
   def test_end_of_month
     assert_equal DateTime.civil(2005,3,31,23,59,59), DateTime.civil(2005,3,20,10,10,10).end_of_month
     assert_equal DateTime.civil(2005,2,28,23,59,59), DateTime.civil(2005,2,20,10,10,10).end_of_month
diff --git a/activesupport/test/core_ext/time_ext_test.rb b/activesupport/test/core_ext/time_ext_test.rb
index 43c92003dc5c23668c85f719b652542e687c1682..2864d7a57fd37ad7e7ef36ddcc64a27ca18edc9a 100644
--- a/activesupport/test/core_ext/time_ext_test.rb
+++ b/activesupport/test/core_ext/time_ext_test.rb
@@ -121,6 +121,10 @@ def test_beginning_of_hour
     assert_equal Time.local(2005,2,4,19,0,0), Time.local(2005,2,4,19,30,10).beginning_of_hour
   end
 
+  def test_beginning_of_minute
+    assert_equal Time.local(2005,2,4,19,30,0), Time.local(2005,2,4,19,30,10).beginning_of_minute
+  end
+
   def test_end_of_day
     assert_equal Time.local(2007,8,12,23,59,59,Rational(999999999, 1000)), Time.local(2007,8,12,10,10,10).end_of_day
     with_env_tz 'US/Eastern' do
@@ -137,6 +141,10 @@ def test_end_of_hour
     assert_equal Time.local(2005,2,4,19,59,59,Rational(999999999, 1000)), Time.local(2005,2,4,19,30,10).end_of_hour
   end
 
+  def test_end_of_minute
+    assert_equal Time.local(2005,2,4,19,30,59,Rational(999999999, 1000)), Time.local(2005,2,4,19,30,10).end_of_minute
+  end
+
   def test_last_year
     assert_equal Time.local(2004,6,5,10),  Time.local(2005,6,5,10,0,0).last_year
   end
diff --git a/activesupport/test/core_ext/time_with_zone_test.rb b/activesupport/test/core_ext/time_with_zone_test.rb
index c2b3676aac0f6cc3989914ed7aa538137fbeb8ec..21fef88d79c3622f1cb8d58280c80bcbeb549464 100644
--- a/activesupport/test/core_ext/time_with_zone_test.rb
+++ b/activesupport/test/core_ext/time_with_zone_test.rb
@@ -539,6 +539,20 @@ def test_end_of_hour
     assert_equal "Fri, 31 Dec 1999 19:59:59 EST -05:00", twz.end_of_hour.inspect
   end
 
+  def test_beginning_of_minute
+    utc = Time.utc(2000, 1, 1, 0, 30, 10)
+    twz = ActiveSupport::TimeWithZone.new(utc, @time_zone)
+    assert_equal "Fri, 31 Dec 1999 19:30:10 EST -05:00", twz.inspect
+    assert_equal "Fri, 31 Dec 1999 19:00:00 EST -05:00", twz.beginning_of_hour.inspect
+  end
+
+  def test_end_of_minute
+    utc = Time.utc(2000, 1, 1, 0, 30, 10)
+    twz = ActiveSupport::TimeWithZone.new(utc, @time_zone)
+    assert_equal "Fri, 31 Dec 1999 19:30:10 EST -05:00", twz.inspect
+    assert_equal "Fri, 31 Dec 1999 19:30:59 EST -05:00", twz.end_of_minute.inspect
+  end
+
   def test_since
     assert_equal "Fri, 31 Dec 1999 19:00:01 EST -05:00", @twz.since(1).inspect
   end