miniui格式化日期的方法

<div field="InsertTime" renderer="ondayRenderer" headerAlign="center" width="40" align="center">日期</div>

function ondayRenderer(e) {
            if (e.value != "合计") {
                var value = new Date(e.value);
                if (value) return mini.formatDate(value, 'dd');
            }
            else {
                return e.value;
            }
        }