I have MB pro mid 2015 and the clock is running consistently 47 seconds fast - checking on time.is - and can't seem to bring it back to sync. I've opened the clock setting un-checked and re-checked all of the auto set date and time. I've tried different time zones, different apple clocks Asia, Europe still no luck. - My Mac Pro time is dead nuts using the same time.is web site, as is my HP laptop using the same wi-fi connection.