On Wed, 27 Aug 2025 at 23:57, Munkh-Erdene Erdenebat via tz <[email protected]> wrote:
> The Hovd timezone is observed in three provinces: Hovd, Bayan-Ulgii, and > Uvs. > > However, when I checked the tzdata files (zone.tab and zone1970.tab), it > lists *five provinces* under the Hovd timezone. My understanding is that > it should be only the three provinces mentioned above. > It appears you may be looking at an older version of tzdata files. In the latest release, 2025b, the two Mongolia (MN) lines in zone1970.tab read as follows: MN +4755+10653 Asia/Ulaanbaatar most of Mongolia MN +4801+09139 Asia/Hovd Bayan-Ölgii, Hovd, Uvs As recently as July 2024, we made some changes to better reflect the information that had been made available to us about historical timekeeping in Mongolia: https://github.com/eggert/tz/commit/7eb5bf887927e35079e5cc12e2252819a7c47bb0 This change, first released in version 2024b on 4 September 2024, removed Govi-Altai and Zavkhan provinces from the comments field for Asia/Hovd, bringing the formerly listed five provinces down to three. If you have better data for the history of Mongolian timekeeping, backed by appropriate publicly-available news or government sources, we'd be very happy to hear about it as many of our existing sources are conflicting. -- Tim Parenti
