dateObject.toGMTString()
 
//dateObject 的字符串表示。此日期会在转换为字符串之前由本地时区转换为 GMT 时区。

<script type="text/javascript">
var d = new Date()
document.write (d.toGMTString())
</script>
 
//上例会输出例如：Thu, 23 Jul 2009 05:20:27 UTC 的格式

<script type="text/javascript">
var born = new Date("July 21, 1983 01:15:00")
document.write(born.toGMTString())
</script>
 
//上例会输出：Wed, 20 Jul 1983 17:15:00 UTC 的格式