--- pdf.rb	2013-02-12 01:41:32.000000000 +0100
+++ pdf_new.rb	2013-02-12 01:42:40.000000000 +0100
@@ -267,6 +267,8 @@
               format_date(value)
             elsif value.is_a?(Time)
               format_time(value)
+            elsif column.name == :spent_hours || column.name == :estimated_hours
+              value = (value.to_f != 0 ? ("%.2f" % value.to_f) : "")			  
             else
               value
             end