On Mon, 1 May 2023 at 15:15, Jan Harris via tz <tz@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 https://tzdata-meta.timtimeonline.com/

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