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 > >
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