2 files changed, 28 insertions, 7 deletions
diff --git a/activesupport/lib/active_support/core_ext/date/calculations.rb b/activesupport/lib/active_support/core_ext/date/calculations.rb
index 3038729d34..755d96ce91 100644
--- a/activesupport/lib/active_support/core_ext/date/calculations.rb
+++ b/activesupport/lib/active_support/core_ext/date/calculations.rb
@@ -2,6 +2,7 @@ require 'date'
 require 'active_support/duration'
 require 'active_support/core_ext/time/zones'
 require 'active_support/core_ext/object/acts_like'
+require 'active_support/deprecation'
 
 class Date
   if RUBY_VERSION < '1.9'
@@ -146,20 +147,30 @@ class Date
     advance(:years => years)
   end
 
-  # Short-hand for years_ago(1)
-  def last_year
-    years_ago(1)
+  def last_year # :nodoc:
+    ActiveSupport::Deprecation.warn("Date#last_year has been deprecated, please use Date#prev_year instead", caller)
+    prev_year
   end
 
+  # Shorthand for years_ago(1)
+  def prev_year
+    years_ago(1)
+  end unless method_defined?(:prev_year)
+
   # Short-hand for years_since(1)
   def next_year
     years_since(1)
   end unless method_defined?(:next_year)
 
+  def last_month # :nodoc:
+    ActiveSupport::Deprecation.warn("Date#last_month has been deprecated, please use Date#prev_month instead", caller)
+    prev_month
+  end
+  
   # Short-hand for months_ago(1)
-  def last_month
+  def prev_month
     months_ago(1)
-  end
+  end unless method_defined?(:prev_month)
 
   # Short-hand for months_since(1)
   def next_month
diff --git a/activesupport/lib/active_support/core_ext/time/calculations.rb b/activesupport/lib/active_support/core_ext/time/calculations.rb
index 2b47ecd543..e27b08ec2e 100644
--- a/activesupport/lib/active_support/core_ext/time/calculations.rb
+++ b/activesupport/lib/active_support/core_ext/time/calculations.rb
@@ -2,6 +2,7 @@ require 'active_support/duration'
 require 'active_support/core_ext/date/acts_like'
 require 'active_support/core_ext/date/calculations'
 require 'active_support/core_ext/date_time/conversions'
+require 'active_support/deprecation'
 
 class Time
   COMMON_YEAR_DAYS_IN_MONTH = [nil, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
@@ -132,8 +133,13 @@ class Time
     advance(:years => years)
   end
 
+  def last_year # :nodoc:
+    ActiveSupport::Deprecation.warn("Time#last_year has been deprecated, please use Time#prev_year instead", caller)
+    prev_year
+  end
+
   # Short-hand for years_ago(1)
-  def last_year
+  def prev_year
     years_ago(1)
   end
 
@@ -142,9 +148,13 @@ class Time
     years_since(1)
   end
 
+  def last_month # :nodoc:
+    ActiveSupport::Deprecation.warn("Time#last_month has been deprecated, please use Time#prev_month instead", caller)
+    prev_month
+  end
 
   # Short-hand for months_ago(1)
-  def last_month
+  def prev_month
     months_ago(1)
   end