[tz] Adding verified historic details

Lester Caine lester at lsces.co.uk
Wed Sep 4 21:15:32 UTC 2013

Paul Eggert wrote:
> On 09/04/13 13:43, Lester Caine wrote:
>> >Is that good enough to merge?
> I'm afraid we can't add zones that differ only in pre-1970
> dates until we can figure out how to filter them out in
> the default case, as we aren't prepared for the
> hundreds or thousands of new zones that would be feasible
> if we opened the floodgates.  Zefram has one prototype for
> filtering, which I really must get to at some point.

Paul - this is the point of contention !

Deleting any data is wrong. If users have a reason for only viewing part of the 
data then fair enough, but we have the opportunity here to get this right before 
it becomes embedded in every browser. That does not want a broken set of 
timezones with this arbitrary cutoff - THAT is the very thing some of us want to 
get away from.

If you want a 1970+ only database then it should be advertised as that, and we 
can create a second one which has all of time ... any distribution and API 
should be using the full range, just as their calendar should be accurate for 
historic dates. The only time hiding data is acceptable is when the user has 
good reason to do so. The distributed data does not have that luxury!

Lester Caine - G8HFL
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