[tz] More prominent/consistent record of rule change notification date?

Tim Parenti tim at timtimeonline.com
Mon May 1 22:11:49 UTC 2023

On Mon, 1 May 2023 at 15:15, Jan Harris via tz <tz at iana.org> wrote:

> I think it would be helpful if there was a clear record of *WHEN* IANA is
> officially notified of TZ changes, so users could understand this is the
> result of their government changes, and notification processes, it is not a
> "defect" in how IANA or vendors roll out these updates.

To assist with this type of effort, for the past few years, I've been
tracking some of this data as a personal side project at

As has been pointed out, "official" is often a nebulous concept, especially
with fast-moving and last-minute changes, so there is a bit of guesswork
involved and no warranty is made as to accuracy or fitness of this data for
any given purpose.

I also haven't yet managed to update this metadata for the changes released
in 2023{a,b,c}.  Those were quite turbulent there for a while.

Tim Parenti
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