First, make sure that your date column data type is set to date and then in your form we need to change the format of the date to look like this 'yyyy-mm-dd'.
In DW look for these lines of code:
changeMonth: true,
changeYear: true,
and change it to:
changeMonth: true,
changeYear: true,
dateFormat:'yy-mm-dd',
And then on the bottom of the page change the spry validation from:
format:'mm/dd/yyyy'
to
format:'yyyy-mm-dd'