jQuery(document).ready(function() {
	jQuery('form').submit(function() {
		jQuery('.date_field_parts').each(function () {
			parts = jQuery(this).val().split(',');
			tz_output = jQuery('#' + parts.pop());
			unix_output = jQuery('#' + parts.pop());
			// the order of the parts array is day of month, month, full year, tz_offset, unix_output
			local_date = new Date(parseInt(jQuery('#' + parts[2]).val()), parseInt(jQuery('#' + parts[1]).val()) - 1, parseInt(jQuery('#' + parts[0]).val()), 0, 0, 0, 0);
			tz_output.val(local_date.getTimezoneOffset());
			unix_output.val(local_date.getTime());
		});
	});
});