Paul - thanks! That's very helpful. I'm sure we'll revisit this topic moving forward, but for now, that's very good to know. Thanks, Jeff
On Fri, May 18, 2018 at 12:19 PM, PauLL170 <[email protected]> wrote: > Hi, > > "1954..1973" means the object first appeared at an unknown date between > 1954(-01-01) and 1973(-12-31). I mentioned the ".."-format in my mail from > May 8 in the old thread. If we focus upon the ".."-format (I advocate this > at the moment) start_date=1910 means start_date=1910-01-01..1910-12-31. > > "before 1904" means that 1903 is the oldest verifiable date for that > object (see https://wiki.openstreetmap.org/wiki/Key:start_date# > Approximations). So it could have first appeared between the beginning of > time and 1903-12-31. So it means "[oldest date we technically take in > consideration (like 4,57 billions of years)]..1903-12-31". > > Best regards, > Paul > >> >> > -- Jeff Meyer 206-676-2347 osm: Open Historical Map (OHM) <http://wiki.openstreetmap.org/wiki/Open_Historical_Map> / my OSM user page <http://www.openstreetmap.org/user/jeffmeyer> t: @OpenHistMap
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