hi all,
i'm trying to implement automatic timezone adjustment in one of my
application, it should work based on the country,state and city which
users specify in their account settings.

i have two questions.

1. since there are thousands of cities, what is the best and the
easiest way to figure out the correct time zone for each
country-state-city combination? (i couldn't find a free database or a
service for this specific purpose, but those many social networking
sites do this)

2. http://en.wikipedia.org/wiki/Zoneinfo says 'It also includes
transitions such as daylight saving time, and even records leap
seconds', does this means, that i do not have to worry about DST

many thanks!


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