Of all the watches that I have, and I'm something of a watch geek, this very modest, inexpensive Casio is so reliable that it gets boring. Notice that it doesn't have a crown. That's because you never have to set it. When I ordered it, and it arrived, I opened the box, the hands flew around, and it has been with in one second of the correct time ever since.
It is solar powered, so you never have to replace the battery. The dial is a solar panel. It synchronizes with all of the atomic clocks around the world, and every night at midnight, here in the states, it resets itself to the signal from Colorado.
The buttons allow you to perform lots of functions, like have the digital readout show a second time zone, or use it as a stopwatch. But I just leave it on the day date, as shown. Of course it resets itself to daylight savings time, and you can have it show other time zones.
But mostly, you don't have to do anything but wear it. It is always correct.
Less than a hundred dollars, and absolutely reliable.
Pretty boring!!
Best Regards, Les