Creating membership type with period fixed and start date/rolling date gives warning.

When trying to add new MembershipType with period type fixed, period start day and period rolling day with month upto september give notice.
Notice: Undefined index: in CRM_Member_BAO_MembershipType::convertDayFormat() (line 227 of /sites/all/modules/civicrm/CRM/Member/BAO/MembershipType.php).

and warning when editing membership

Warning: mktime() expects parameter 4 to be long, string given in CRM_Member_BAO_MembershipType::getDatesForMembershipType() (line 343 of /sites/all/modules/civicrm/CRM/Member/BAO/MembershipType.php).

The reason being, at line no 406 in https://github.com/civicrm/civicrm-core/blob/master/CRM/Member/Form/MembershipType.php#L406.
It check for month and day less than 9 which should be 10.
Attached is the patch against master to fix the same.