Format conversion issue

Hi,
we have this instance of pickadate

$('.datepicker').pickadate({
selectMonths: true,
selectYears: true,
format: 'dd-mmm-yyyy',
firstDay: 1,
formatSubmit: 'ddmmyyyy'
});

and this input
< input class="datepicker" type="text" id="volo_XX_ppvddatain" name="volo[XX][ppvddatain]" data-value="10052015" >

but the format are wrong:


all the values from the day 01 to 09 are views correctly, but from 10 to 31 are views always 01/01/1970.

If i use formatSubmit dd/mm/yyyy all works fine!!

Please help me.

Thanks