"When it is Oct 28, 2010 09:00 in United States/San Francisco, what time will it be in United Kingdom/London?" Often people ask this kind of questions; especially when you work with people in different time zone, and you want to know when they say the meeting is 9:00am San Francisco time, what will it be in your time zone, vice versa. This apps converts any time from one time zone to another time zone, considering the daylight saving in. It covers about 6000 cities and regions. The city time zone data is from the latest public City Time Zones database; the region time zone data is from tz database. This free version has iAd's (advertisement); or you can get the non-iAd version TzConvertor for $0.99. TzConvertor is faster than TimeZoneConvertorFree, since not running advertisement.