[blunte]

If software worked correctly...

But if you do much international travel, at some point you will encounter the problem where your various calendars, clocks, and other tools don't do the right thing (perhaps they get incorrect location information, or any number of other problems occur).

Then you have dis-information. If you don't realize it, then you will suffer by missing something important or wasting your time.

The tools are far from infallible now, and there's really no hope that they will ever work correctly.