1 files changed, 1 insertions, 1 deletions
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 e16ad55fbd..4ec75288ca 100644
--- a/activesupport/lib/active_support/core_ext/date_time/calculations.rb
+++ b/activesupport/lib/active_support/core_ext/date_time/calculations.rb
@@ -18,7 +18,7 @@ module ActiveSupport #:nodoc:
           ::DateTime.civil(
             options[:year]  || self.year,
             options[:month] || self.month,
-            options[:day]   || options[:mday] || self.day, # mday is deprecated
+            options[:day]   || self.day,
             options[:hour]  || self.hour,
             options[:min]   || (options[:hour] ? 0 : self.min),
             options[:sec]   || ((options[:hour] || options[:min]) ? 0 : self.sec),