[Tagging] Mapping time zones as geometries (relations)

Paul Johnson baloo at ursamundi.org
Mon Mar 6 16:51:17 UTC 2017

On Mon, Mar 6, 2017 at 10:42 AM, Colin Smale <colin.smale at xs4all.nl> wrote:

> On 2017-03-06 17:21, Paul Johnson wrote:
> On Mar 5, 2017 18:30, "Frederik Ramm" <frederik at remote.org> wrote:
> Hi,
>    I would like to start a discussion about the mapping of time zones.
> What do you think?
> I'm generally opposed to mapping timezones in OpenStreetMap unless the
> tzdata maintainers are 100% on board.  Since timezones are a royal pain to
> keep track of, often changing 100+ times a year, on as little as a few
> hours notice in some cases.
> Do you mean territories switch to another timezone 100+ times a year, or
> that the details of the timezone (DST dates etc) change 100+ times a year?
> If it's the latter, it won't be a problem for OSM if we only store the TZ
> name. Looking at the archives of the tz-announce mailing list, there are
> only 1-2 actual changes per month which would affect OSM. I think there are
> more changes to admin boundaries than to timezones.

No, the maddening number of changes unrelated to DST.  Computerphile rather
accurately describes the situation
<https://www.youtube.com/watch?v=-5wpm-gesOY>.  I only have to deal with it
tertiarily in my line of work and it's still caused a lot of problems for
us as a company.

> In what way would the tzdata maintainers need to be "on board"?

Considering that group most closely tracks this, it would be best if we
worked very closely together on getting this data right.  A lack of close
collaboration would rather render having this data in OpenStreetMap
outdated very quickly.
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