Hey Andreas,
If you've created the form with Form Generator, you will probably have a section of code like this in the generated script:
if (fg_util_isPartialDate('examination_date')) { $_REQUEST['examination_date'] = ''; } // clear invalid dates
else { $_REQUEST['examination_date'] = sprintf("%04d-%02d-%02d %02d:%02d:%02d", @$_REQUEST['examination_date:year'], @$_REQUEST['examination_date:mon'], @$_REQUEST['examination_date:day'], 0, 00, 00); }
These lines are part of the date validation when a date field is being handled by the three dropdowns. Changing to a single input can cause some unexpected behaviour. Try commenting these lines, and let me know if that helps.
Thanks!
Daniel
Technical Lead
interactivetools.com