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-rw-r--r--lib/redmine/helpers/gantt.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/redmine/helpers/gantt.rb b/lib/redmine/helpers/gantt.rb
index 398f8233f..27faf0a96 100644
--- a/lib/redmine/helpers/gantt.rb
+++ b/lib/redmine/helpers/gantt.rb
@@ -21,6 +21,7 @@ module Redmine
class Gantt
include ERB::Util
include Redmine::I18n
+ include Redmine::Utils::DateCalculation
# :nodoc:
# Some utility methods for the PDF export