$('#js-start-time').datepicker({

	dateFormat:'yy-mm-dd',

	onSelect: function( startDate ) {

		var $startDate = $( "#js-start-time" );

		var $endDate = $('#js-end-time');

		var endDate = $endDate.datepicker( 'getDate' );

		if(endDate < startDate){

			$endDate.datepicker('setDate', startDate - 3600*1000*24);

		}

		$endDate.datepicker( "option", "minDate", startDate );

	}

});

$('#js-end-time').datepicker({

	dateFormat:'yy-mm-dd',

	onSelect: function( endDate ) {

		var $startDate = $( "#js-start-time" );

		var $endDate = $('#js-end-time');

		var startDate = $startDate.datepicker( "getDate" );

		if(endDate < startDate){

			$startDate.datepicker('setDate', startDate + 3600*1000*24);

		}

		$startDate.datepicker( "option", "maxDate", endDate );

	}

});