怎么将UTC格式的日期格式化为字符串

代码如下：

Date.UTC(2015, 11, 1,21,37);
>1449005820000
new Date(1449005820000);
>Wed Dec 02 2015 05:37:00 GMT+0800 (中国标准时间)
new Date(1449005820000).toISOString().
  replace(/T/, ' ').      // replace T with a space
  replace(/\..+/, '')     // delete the dot and everything after
>"2015-12-01 21:37:00"

参考：How to format a date string in UTC；