What Time Is It?

Last night, the power went out for about 45 minutes (a rare thing around here). When it came back on, I realized that there is not one single clock in this house that had to be re-set. In fact, we only have 3 clocks in the house: one in the kitchen (that runs on batteries) and two that are part of an indoor/outdoor thermometer set (which also run on batteries). We don't have alarm clocks or clocks on the DVD player or even the microwave.
I don't know why, but this seems very strange to me.