On 03/10/14 20:38, Guy Harris wrote:
1) have a database to map locations to tzids; This is what geonames currently provides, but using the 'full' TSID list from TZ currently. That requires manual management of every locations setting, but there is no getting away from that. The coordinates for every location is also provided, which can be used as required. What is missing is the gap between what is valid data on TZ and the actual location based history.
For example when Oxford switched from Oxford time to Europe/London and in parallel when railway time was used at the station. Basically how to add this historic data to the time offset system. There is a substantial amount of data on top of 'Europe/London' in addition to the small amount contained in backzone in relation to the other aliases which are currently truncated to match Europe/London. -- Lester Caine - G8HFL ----------------------------- Contact - http://lsces.co.uk/wiki/?page=contact L.S.Caine Electronic Services - http://lsces.co.uk EnquirySolve - http://enquirysolve.com/ Model Engineers Digital Workshop - http://medw.co.uk Rainbow Digital Media - http://rainbowdigitalmedia.co.uk