If you want to spend I little extra if you get a 'radio controlled' clock it means it always tells the time correctly even when then clocks go forward/back or you have to put new batteries in! It picks up the time from radio signal with a little aerial built into the clock.
The only problem I get with these modern LCD travel clocks in general, is that with all the buttons on the surface of the clock when I put it in my suitcase all the buttons just get pressed in and out and the clock can have the time changed and the alarm time changed accidentally. To stop this I have to take the batteries out. They often don't have an on/off switch!