Local time - UTC offset and daylight saving correction

[geeqie.git] / ZoneDetect.md

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+The detection of timezone is performed by
+ [ZoneDetect](https://github.com/BertoldVdb/ZoneDetect)
+ 
+ timezone16.bin has a longitude resolution of 0.0055 degrees (~0.5km).  
+ timezone21.bin has a longitude resolution of 0.00017 degrees (~20m).
+ 
+ The safe zone result indicates how close you are to the nearest border (flat earth model using lat and lon as x and y), so you can know when to do a new lookup. If you don't need it you can ignore it, in this case you can pass a NULL parameter to save the (very small) calculation effort.
+ 
+ 
+ Note that the [underlying database](https://github.com/evansiroky/timezone-boundary-builder) will change from time-to-time.