My Alarm Clock Doesn't Work Exactly The Way It's Not Supposed To

I brought an alarm clock over from the United States, plugged it into a cheap 230V-110V AC converter, and noticed right away that it doesn't keep accurate time. It seemed to run slow, losing several hours a day. So I took a stopwatch and found that, as a matter of fact, one minute on my clock takes exactly seventy-two seconds. Sixty divided by seventy-two is five-sixths -- the ratio of the frequency of UK power (50Hz) to American power (60Hz). It seems my alarm clock keeps time by the frequency of its input, and since it's only getting fifty peaks per second when it expects sixty, it's running slow.

This is cool enough that I don't feel too bad about having to buy a new clock.