Specifying the value output of of an HTML5 input type = date?

Question

I\'d like to add native date pickers to my application, which currently uses a legacy, home-rolled system. Date input support isn\'t widespread, yet, but if I could present

Answer 1

The HTML5 date input field is specific about the format it uses: RFC 3339 full-date

Is it possible to change the legacy date picker to use yyyy-mm-dd format (and update the server side that reads that)?

I assume not, so then you can add some Javascript glue code that listens for a change event on the HTML5 input and updates a hidden date value field to match the format of the legacy date picker (converts yyyy-mm-dd to dd-MMM-yyyy).