Request for Update: Iran's Official Time Zone – No Daylight Saving Time Since 2023
Dear Time Zone Database Maintainers, I hope this message finds you well. I am writing to bring your attention to an important legal update regarding the official timekeeping policy of the Islamic Republic of Iran. In March 2022, the Iranian Parliament passed legislation to permanently abolish Daylight Saving Time (DST), effective from March 2023. As a result, Iran now observes a fixed time zone of UTC+3:30 throughout the entire year, with no forward or backward clock shifts. This change is now fully implemented across all provinces and official systems within the country. However, it has come to our attention that some international platforms, time services, and applications may still reflect outdated DST rules for Iran, which can lead to errors in scheduling, communication, and automation. Given the widespread reliance on the IANA Time Zone Database (tzdata) by global operating systems and applications, we kindly request that you verify and reflect this official update in the relevant database records (Asia/Tehran) to ensure accurate representation of Iran’s current time zone policy. Should you require further documentation or references to the legislation, I would be glad to provide official sources or translations as needed. Thank you for your attention to this matter and for your continued efforts in maintaining a reliable and globally synchronized time zone system. Sincerely, [Khalil Kharazi]
On Mon, 19 May 2025 at 19:20, Khalil Kharazi via tz <tz@iana.org> wrote:
In March 2022, the Iranian Parliament passed legislation to permanently abolish Daylight Saving Time (DST), effective from March 2023. As a result, Iran now observes a fixed time zone of UTC+3:30 throughout the entire year, with no forward or backward clock shifts.
After the initial implementation delays in March 2022, we received word of this legislation being finalized on 10 May 2022 and added this change, taking effect from March 2023, to our development repository on the same day. See: https://mm.icann.org/pipermail/tz/2022-May/031400.html https://github.com/eggert/tz/commit/66b18d9835dda089d65349c86e7851c4f0746e09 This change was ultimately incorporated into tz release 2022b, which was released on 10 August 2022.
However, it has come to our attention that some international platforms, time services, and applications may still reflect outdated DST rules for Iran, which can lead to errors in scheduling, communication, and automation.
Given the widespread reliance on the IANA Time Zone Database (tzdata) by global operating systems and applications, we kindly request that you verify and reflect this official update in the relevant database records
Since the change has been released by us for nearly three years now, you will need to encourage downstream packagers, maintainers, and users to update their systems to use the latest version of tz data, which we update several times per year. The current version is 2025b; see: https://www.iana.org/time-zones -- Tim Parenti
participants (2)
-
Khalil Kharazi -
Tim Parenti