I've submitted a support ticket asking about this.
According to support the Go sets its time by syncing with network time. To quote: "in order for the time to change on the headset you would have to sync it to the network. Once that's been done you would restart the phone and the headset." Hope this helps.
I could not get clock to autoset and could not get the internet due to this. Had to jump on home screen then try to browse and error came up stating my time and date were not correct and could not connect. It looked like white browser screen with error code and blue box appeared on the bottom right stating "Set time and date" It then brought up a time and date settings, I had to enable\allow network to set time and date. I also had the option below to manually set time and date but just enabled auto and it set itself. I also had to jump on another network before this error page would apear. Could not find any other place to set time and date in OS or on app. All working now