diff --git a/lib/report/operator.rb b/lib/report/operator.rb
index 03b6a01dd8..88e7111830 100644
--- a/lib/report/operator.rb
+++ b/lib/report/operator.rb
@@ -37,7 +37,7 @@ class Report::Operator
     new "w", :arity => 0, :label => :label_this_week do
       def modify(query, field, offset = nil)
         offset ||= 0
-        from = Time.now.at_beginning_of_week - ((I18n.t(:general_first_day_of_week).to_i % 7) + 1).days
+        from  = Time.now.utc.at_beginning_of_week + (Integer(I18n.t(:general_first_day_of_week)) % 7) - 1).days
         from -= offset.days
         '<>d'.to_operator.modify query, field, from, from + 7.days
       end