I am a software engineer working for an avionics company. I am currently working on a project that requires the software I will create to know the time any place on earth given a latitude and longitude. Time zone boundaries and time rules will need be updated on a monthly basis.

This task is proving to be very difficult. The most difficult part is getting up to date data on for time zone boundaries. Most of the services and databases I have researched only give time zone information for a particular city in that given time zone (ie. Olson Time Zone Database), I have yet to find anything that defines the actual time zone boundaries.

Is there a service or database that gives up to date boundary and time rules monthly, and has worldwide coverage?

Thanks in advance,

Rod Williams