• make international phone calls at the correct times

• schedule conference calls with people overseas

• make that trade at precisely the right time

"Why can't I just add 6 hours whenever I call someone in London?"

Well you can. But do you know on what date they change their clocks for daylight saving? It changes every year.

Or what about Sydney Australia, or Bangalore India? Do you know their time zones and daylight saving dates?

Time Zones for PCs^® is built around a comprehensive database of over 1500 cities and towns, in 252 individual time zones, across 240 countries.^† We have designed it to have 100% coverage of all the time zones in the world, and we automatically update the database whenever changes occur.

^† Statistics vary slightly with each database release.