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Unfortunately, it is not possible, you could try to just add manually text boxes or drop down to recreate a date field, here's an example:
You can move them to the same line by following this guide on how to position fields: http://www.jotform.com/help/90-Form-Field-Positioning.
Here's my sample form: http://form.jotformpro.com/form/51045054403947?
We can further adjust the width and the padding by using custom CSS codes.
I hope that helps.