1 files changed, 15 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/core_ext/time/calculations.rb b/activesupport/lib/active_support/core_ext/time/calculations.rb
index 1434e186c3..a0f610d60c 100644
--- a/activesupport/lib/active_support/core_ext/time/calculations.rb
+++ b/activesupport/lib/active_support/core_ext/time/calculations.rb
@@ -257,6 +257,21 @@ class Time
     )
   end
 
+  # Returns a new Time representing the start of the hour (x:00)
+  def beginning_of_hour
+    change(:min => 0)
+  end
+  alias :at_beginning_of_hour :beginning_of_hour
+
+  # Returns a new Time representing the end of the hour, x:59:59.999999 (.999999999 in ruby1.9)
+  def end_of_hour
+    change(
+      :min => 59,
+      :sec => 59,
+      :usec => 999999.999
+    )
+  end
+
   # Returns a new Time representing the start of the month (1st of the month, 0:00)
   def beginning_of_month
     #self - ((self.mday-1).days + self.seconds_since_midnight)