The reason I ask: If the value from the datapicker is in the format "mm/dd/yyyy" or "dd/mm/yyyy" then it won't work with MySQL. MySQL requires format "yyyy-mm-dd". So you need to either re-format the date in your PHP code or use a MySQL function that will convert from the wrong format to the right one.
An optimist sees the glass as half full.
A pessimist sees the glass as half empty.
A realist drinks it no matter how much there is.