Datepicker formating

I’m not 100% sure if this is a bug or on purpose.
When the datepicker with a custom formating is used, the formating only applies in the datepicker field. The actual date value still is a normal ISO-date. My database requires a date without dashes (Like: YYYYMMDD).

After fetching the value of the datepicker into a textinput below it looks like this:

And the tooltip of the format is wrong as stated in this topic:

I suggest to use the same format rules as in MySQL DATE_FORMAT