Many thanks again, Ally!
OK, will do 
Is it possible to validate a date field, check the date format immediately and print out an error message, if the format is wrong? For example: I need to have the format dd.mm.yyyy but the user inputs dd.mm.yy. Error message could be sth. like this: “Please enter the correct date format” Or is it even possible to change the input into the right format automatically?
Regards,
Thomas