1 files changed, 6 insertions, 2 deletions
diff --git a/lib/chef/resource/cron.rb b/lib/chef/resource/cron.rb
index 72f86bc974..0a29afd276 100644
--- a/lib/chef/resource/cron.rb
+++ b/lib/chef/resource/cron.rb
@@ -121,8 +121,12 @@ class Chef
           converted_arg = arg
         end
         begin
-          if !arg.is_a?(Symbol) && integerize(arg) > 7
-            raise RangeError
+          error_message = "You provided '#{arg}' as a weekday, acceptable values are "
+          error_message << Provider::Cron::WEEKDAY_SYMBOLS.map {|sym| ":#{sym.to_s}"}.join(', ')
+          error_message << " and a string in crontab format"
+          if (arg.is_a?(Symbol) && !Provider::Cron::WEEKDAY_SYMBOLS.include?(arg)) ||
+            (!arg.is_a?(Symbol) && integerize(arg) > 7)
+            raise RangeError, error_message
           end
         rescue ArgumentError
         end