Custom date format and initializing with existing date

[YANOUSHek]

I'm using the datepicker with custom date format (%d-%m-%Y) and I'm having issues when the datepicker is connected to an input that already contains a date inside (i.e. a standard edit form). It looks like this line doesn't really care about the set format and tries copying the value from input field into the dateValue which later breaks the whole controller.