For about six months or so, the network clock on the computer is ten minutes fast.
You get used to that, and learn to subtract ten minutes whenever you look at the clock.
Then they change it to fifteen minutes fast.
That’s OK. You’re earlier to a couple of meetings than you normally would have been, but nothing’s wrong with early. And you learn to subtract fifteen.
Then a couple months later, over the weekend, it’s set to two minutes slow.
I think I need to buy a watch.