Have you ever made a phone call to Australia, India, or China, only to learn that you have awakened someone in the middle of the night? Too often, when we phone friends, relatives or associates somewhere in the world, we completely miscalculate the time in their country of residence.

That's why WorldTimeZone (www.worldtimezone.com) can be such a valuable device, used by some 80,000 people a day. It's the brainchild of a Russian immigrant to the U.S., Alexander Krivenyshev, and its core feature is a map of the entire world telling you exactly the time of day (or night) in every country. Thus, as I am writing this, the map advises me it is 4:45pm in New York, where I live. Simultaneously, it shows me that it is 4:45am in Beijing, 2:15am in New Delhi, and 4.45am in Sydney, Australia.

The digital clock for each country changes every minute.

Amazing how such an important but overlooked need could have been discovered by Mr. Krivenyshev, resulting in a service of such widespread importance. His website is covered with advertising and is apparently valued by people all over the world. Once you use it, you often return to it.