Historical data for Iran
Hi, The timezone database currently lists Iran switching to standard time in 1946. I've been doing some research on the history of the adoption of standard time by Iran, and while it's very hard to find much, I found that the correct date is actually 1935. Here's an order from the Cabinet to the rest of the government to switch to Tehran time, which is mentioned to be already at +03:30: https://qavanin.ir/Law/TreeText/180138 Just in case that goes away, I also saved a copy at archive.org: https://web.archive.org/web/20220530111940/https://qavanin.ir/Law/TreeText/1... Here's my translation: "Circular on Matching the Hours of Governmental and Official Circles in Provinces Approved 1314/03/22 [=1935-06-13] According to the ruling of the Honorable Cabinet, it is ordered that from now on in all internal provinces of the country, governmental and official circles set their time to match Tehran time (three hours and half before Greenwich). It is required to mind the above order. For Minister of Judiciary, Dr Matin-Daftari" Now, I still haven't found out when Tehran itself switched to +03:30 (let's assume some time earlier in 1935), but it is clear that standard time in Iran started on 1935-06-13 and not 1946. Thanks, Roozbeh
On 2022-05-30 23:46, Paul Eggert via tz proposed the text:
# ... but it is clear that standard time in # Iran started on 1935-06-13 and not 1946.
No, the date 1935-06-13 indicated in the order is the date of approval of the cabinet order. It could take effect on the next midnight at the earliest, but not on the previous midnight. Michael Deckers.
On 5/31/22 07:58, Michael H Deckers wrote:
It could take effect on the next midnight at the earliest,
The translated text doesn't give any effective date or time. Possibly the rule change was effective the instant the vote was taken. In practice no doubt it took some time for people to actually change their clocks. Without further information the usual practice in tzdb for this sort of thing is to just give the date, as an approximation that's good enough.
I obviously have not stated my point clearly enough. The proposed text # ... but it is clear that standard time in # Iran started on 1935-06-13 and not 1946. is incorrect. The decision to apply Tehran time in the government offices throughout the country was taken on 1935-06-13 (certainly not at midnight), so that it is by no means clear that it could have been applied on 1935-06-13 at 00:04:16 in the whole country. It is also not clear that usage of UT + 03:30 in government offices implies its usage as standard time. While inclusion of incorrect statements into the comments does not affect the TZif files, it is bound to confuse contributors in the future, who may not have seen the current updates to Asia/Tehran and have to assume that sources for these incorrect statements exist. What really can be stated on the basis of the referenced document is that On 1935-06-13, UT + 03:30 was already in use as Tehran time, so that the switch from LMT to UT + 03:30 cannot have occurred as late as 1946 (as specified by Shanks & Pottenger). Michael Deckers.
Michael H Deckers wrote in <6dfd80b9-b132-a33b-aee3-8f7181a44efe@googlemail.com>: ... | What really can be stated on the basis | of the referenced document is that | | On 1935-06-13, UT + 03:30 was already | in use as Tehran time, so that the | switch from LMT to UT + 03:30 cannot | have occurred as late as 1946 (as | specified by Shanks & Pottenger). Iran was divided and well occupied by England and the Soviet Union under yes support of the USA from 1941 until de-facto 1946, as far as i know. The government tried and pulled all possible triggers to gain back a bit of sovereignity, including the Sha resigning in favour of his son. What i mean is that the time span from 1941 to 1946 is of a fragile sort. Maybe this is what drove _this_ 1946 here. --steffen | |Der Kragenbaer, The moon bear, |der holt sich munter he cheerfully and one by one |einen nach dem anderen runter wa.ks himself off |(By Robert Gernhardt)
Thanks for the clarifications and corrections. I installed the attached commentary patches.
participants (4)
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Michael H Deckers -
Paul Eggert -
Roozbeh Pournader -
Steffen Nurpmeso