Hi all, this discussion has started because of me, so I would like to add few comments:).
Should OSM contains timezone data? I think so. Some said, we should use other sources and overlay them over OSM, but there is no direct mapping except description in human languages, not too usable for computer. Other thing is that available map sources use different shapefiles, so they are not aligned to OSM. You know, I would like to see Prague timezone in my navigation walking along Czech borders.:) Should we use extra geometries for timezones? As Frederik wrote, there are 80 timezone relations now. There is about 850 other relations tagged with timezone attribute, so timezone relations are just fraction of the whole amount and I am not afraid that their amount will grow (too much). Why? Timezone relations are used in places where timezone border goes by river/meridian/territorial waters or to split big countries instead of tagging hundreds of counties/.... We can eliminate some (most?) of them, but not all of them. Btw. timezone tags can be misused too - for example - I removed useless timezone tags from hundreds of small relations in Germany during timezones editation, there was tag at whole country, and at lots of admin boundaries too. Some wrote that timezones are changing. Yes, all OSM are still changing, shops, bus stops, new buildings, forrests cutted, we all do such editations often I think... Some wrote that timezones are not visible. Yes, exactly as lots of other data in OSM. Some wrote - delete timezone relations! Thanx, guys, it took lots of time and work to create them... So, for me, as you can guess, timezone relations are good and usefull solution, but I understand that there could be problems with their sizes and dependence to other geometry. Personally I would compromise - leave timezone relations where really needed (river/meridian/territorial waters/...) and change them to tagged A.B. otherwise. Jaroslav
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