$ go run ./sleepy/main.go 
Current time: 2018-02-07 18:40:47.221076456 -0800 PST m=+0.000345520
Current time UTC: 2018-02-08 02:40:47.221076519 +0000 UTC

Put your machine to sleep for 2 minutes now...

The current time is:  2018-02-07 18:42:44.393655472 -0800 PST m=+60.001694536
The previous time was:  2018-02-07 18:40:47.221076456 -0800 PST m=+0.000345520
The difference between these times is:  1m0.001349016s

The current UTC time is:  2018-02-08 02:42:44.393791308 +0000 UTC
The previous UTC time was:  2018-02-08 02:40:47.221076519 +0000 UTC
The difference between these UTC times is:  1m57.172714789s