js将时间戳转换成格林尼治时间

// 2019-03-26 05:00:00
function formatDateT(dataTime) {               
                var timestamp = dataTime;
                var newDate = new Date(dataTime + 8 * 3600 * 1000 )
                return newDate.toISOString()              
}
formatDateT(1553547600000)// 2019-03-26T05:00:00.000Z