Validation on date picker

3
In our app we have a date of birth field which the users sometimes don't put the year as 'yyyy' and instead 'yy'. The way the date picker works is when the user presses tab or enter it will automatically add either 19yy or 20yy in front of the year. I have looked at the custom date format and it doesnt work as it either sets it to one of the other above. So my question is, is there a way to validate that the user enters the data as 'dd/mm/yyyy' and not 'dd/mm/yy' this isnt as simple as changing the format picker as mendix will automatically add the 2 digits before the date when the user presses save?
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