golang中time类型的这个是什么意思？

If the time has a monotonic clock reading, the returned string includes a final field "m=±<value>", where value is the monotonic clock reading formatted as a decimal number of seconds. 不太理解这句话 http://docs.studygolang.com/pkg/time/#Time.String

试试 ``` time.Now().Format("2017-11-18 16:36:41.8491739 +0800") ```

"2006-01-02 15:04:05.0000000 -0700 MST" 用这个模板是可以的，但是m=+0.008006700 到底是啥东西