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-rw-r--r--activesupport/lib/active_support/core_ext/date_time/calculations.rb1
1 files changed, 1 insertions, 0 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 26979aa906..1dc3933e12 100644
--- a/activesupport/lib/active_support/core_ext/date_time/calculations.rb
+++ b/activesupport/lib/active_support/core_ext/date_time/calculations.rb
@@ -1,5 +1,6 @@
require 'rational' unless RUBY_VERSION >= '1.9.2'
require 'active_support/core_ext/object/acts_like'
+require 'active_support/core_ext/time/zones'
class DateTime
class << self