> At least they feel bad and apologized. Caltrain leaves early 20+ secs all the time and they cared less.

How confident are you that your clock wasn't 20 seconds slow?

https://www.electro-tech-online.com/threads/cell-phone-clock...

> I have a company where everyone has a phone that used the same calender program, same service, same type of phone, etc. At 8:50 and again at 9:00 every phone will ding to announce 9:00 meeting. There is no 0.01 second syncing of the phones. The time might be exactly the same but the "dings" happens over 30 seconds. Then one phone might be a good minute or more off. (usually mine) There are many times where the dings are within 5 seconds.