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<?php
add_filter( 'wp_footer' , 'woo_add_checkout_field_date_range_limit' );

/**
 * woo_add_checkout_field_date_range_limit
 *
 * @access      public
 * @since       1.0 
 * @return      void
 * See: http://jqueryui.com/datepicker/#min-max
*/
function woo_add_checkout_field_date_range_limit() {
	if ( is_checkout() ) {
	?>
	<script type="text/javascript"> 
		jQuery( document ).ready( function ( e ) {
			jQuery(function() {
				jQuery( "#date" ).datepicker({ minDate: 1 });
			});
		});
	</script>
	<?php
	}
}