[tz] Changes to DST in IR/Tehran timezone

Brian Inglis Brian.Inglis at Shaw.ca
Tue May 16 17:47:40 UTC 2023

On 2023-05-16 11:00, Tim Parenti via tz wrote:
> On Tue, 16 May 2023 at 11:54, Jafari Abolfazl wrote:
>> Due to goverments choices, starting from 21st March 2023, Iran dismissed
>> DST and now time should stay at +3:30, but due to lack of contacting with 
>> official channels, it seems lots of systems still use 2023c tz database
>> and time is +4:30.

> We received initial notice of pending changes in Iran last year, on 15 March 2022:
> https://mm.icann.org/pipermail/tz/2022-March/031265.html 
> <https://mm.icann.org/pipermail/tz/2022-March/031265.html>
> A few months later, on 10 May 2022, we were given more finalized notice of the 
> implementation details and made the corresponding changes:
> https://mm.icann.org/pipermail/tz/2022-May/031400.html 
> <https://mm.icann.org/pipermail/tz/2022-May/031400.html>
> https://github.com/eggert/tz/commit/66b18d9835dda089d65349c86e7851c4f0746e09 
> <https://github.com/eggert/tz/commit/66b18d9835dda089d65349c86e7851c4f0746e09>
> These changes have been present in the distribution since version 2022b, which 
> was released on 11 August 2022.
>     This problem cause so many problem specially in smartphone that due to lack
>     of automatic time, many application won't work correctly.
> Unfortunately, there's not much we can do on our end to further encourage 
> downstream vendors to update their copies of our data.  Each maintainer of 
> operating systems, servers, and other platforms has to choose to take the update 
> and deploy it to their customers, and if some devices are old and out of 
> support, they may not ever receive them.

Also if your phone is set to use network time it uses Network Identity and Time 
Zone https://en.wikipedia.org/wiki/NITZ messages from your mobile service 
provider, which may not yet have been updated.
It is also possible some organizations or governments may deploy "Stingray" 
2G/“Hailstorm” 4G/IMSI Catchers/cell site simulators (for tracking or 
eavesdropping) which are not up to date, do not support the current time zone 
settings, or provide correct time.

Take care. Thanks, Brian Inglis              Calgary, Alberta, Canada

La perfection est atteinte                   Perfection is achieved
non pas lorsqu'il n'y a plus rien à ajouter  not when there is no more to add
mais lorsqu'il n'y a plus rien à retirer     but when there is no more to cut
                                 -- Antoine de Saint-Exupéry

More information about the tz mailing list