this morning the clock on my forerunner 230 was 17 minutes ahead but also showing the day before's activity level. Even when I changed the settings for the clock to a manually set time, it was stuck on the day before's activity as current day activity. For me the solution was a quick drive in the car, where I timed the drive as a run, a new GPS signal was acquired and the clock set correctly and the activity level from the day before was gone, so device advanced to "today"