How to convert date into a specific format irrespective of the format given as input?

Hi,

Is there a smart way (Function Module/ Reusable code/ Std FM) to convert a date entered in any format (dd.mm.yyyy/ yyyymmdd/ ....) into a specific format only say dd.mm.yyyy?

OR

How to convert date to a specific format (say. dd.mm.yyyy) irrespective of the format in which it is entered (yyyymmdd/ mm.dd.yyyy/...)?

Thanks in advance,

prajakt