so django 1.5 was giving me nightmare so i resolved my problem by using direct jquery datpicker here is the jquery datepicker
all i had to do is change the id which is a little bit tricky in django .for example if your date field name is start_date then id will be formtools_start_date . and for this kind of datepicker you don't even need any icon to show.. this helped me i hope this will help those also whoever upgraded their django version.