[tz] request to update DST info for Timezone: Tehran/Iran

Mon Apr 15 18:09:32 UTC 2024

> Rule Iran 2021 2022 - Sep 21 24:00 0 -

the last transition was On Sep 21 2022 at 24:00 transition to 0 hours offset.

That means it uses the `3:30 Iran +0330/+0430` statement - i.e. it remains on 3:30.

This aligns with the comment `...DST will be cancelled for the next Iranian year 1402... (i.e 2023-March-21) and forthcoming years.`

The rules have no transition in 2023 or later.

Can you clarify what you'd expect to see be different in the rules?

Tim

________________________________
From: tz <tz-bounces at iana.org> on behalf of Vajihe Bitarafan via tz <tz at iana.org>
Sent: 13 April 2024 06:59
To: tz at iana.org <tz at iana.org>
Subject: Re: [tz] request to update DST info for Timezone: Tehran/Iran

WARNING: This email has originated from outside of EkkoSense. Please treat any links or attachments with caution.

Hi Dear Brian,

Thanks for your response,

I saw that this changes is reflected in documents and it is working correctly in Microsoft windows. but when I download the latest and (some pre-release) of tzdata from this below links
https://www.iana.org/time-zones/repository/tzdata-latest.tar.gz, I saw something different in the "asia" file , section Iran that  is as below:

# Rule NAME FROM TO - IN ON AT SAVE LETTER/S
# Work around a bug in zic 2022a and earlier.
Rule Iran 1910 only - Jan 1 00:00 0 -
#
Rule Iran 1977 only - Mar 21 23:00 1:00 -
Rule Iran 1977 only - Oct 20 24:00 0 -
Rule Iran 1978 only - Mar 24 24:00 1:00 -
Rule Iran 1978 only - Aug 5 01:00 0 -
Rule Iran 1979 only - May 26 24:00 1:00 -
Rule Iran 1979 only - Sep 18 24:00 0 -
Rule Iran 1980 only - Mar 20 24:00 1:00 -
Rule Iran 1980 only - Sep 22 24:00 0 -
Rule Iran 1991 only - May 2 24:00 1:00 -
Rule Iran 1992 1995 - Mar 21 24:00 1:00 -
Rule Iran 1991 1995 - Sep 21 24:00 0 -
Rule Iran 1996 only - Mar 20 24:00 1:00 -
Rule Iran 1996 only - Sep 20 24:00 0 -
Rule Iran 1997 1999 - Mar 21 24:00 1:00 -
Rule Iran 1997 1999 - Sep 21 24:00 0 -
Rule Iran 2000 only - Mar 20 24:00 1:00 -
Rule Iran 2000 only - Sep 20 24:00 0 -
Rule Iran 2001 2003 - Mar 21 24:00 1:00 -
Rule Iran 2001 2003 - Sep 21 24:00 0 -
Rule Iran 2004 only - Mar 20 24:00 1:00 -
Rule Iran 2004 only - Sep 20 24:00 0 -
Rule Iran 2005 only - Mar 21 24:00 1:00 -
Rule Iran 2005 only - Sep 21 24:00 0 -
Rule Iran 2008 only - Mar 20 24:00 1:00 -
Rule Iran 2008 only - Sep 20 24:00 0 -
Rule Iran 2009 2011 - Mar 21 24:00 1:00 -
Rule Iran 2009 2011 - Sep 21 24:00 0 -
Rule Iran 2012 only - Mar 20 24:00 1:00 -
Rule Iran 2012 only - Sep 20 24:00 0 -
Rule Iran 2013 2015 - Mar 21 24:00 1:00 -
Rule Iran 2013 2015 - Sep 21 24:00 0 -
Rule Iran 2016 only - Mar 20 24:00 1:00 -
Rule Iran 2016 only - Sep 20 24:00 0 -
Rule Iran 2017 2019 - Mar 21 24:00 1:00 -
Rule Iran 2017 2019 - Sep 21 24:00 0 -
Rule Iran 2020 only - Mar 20 24:00 1:00 -
Rule Iran 2020 only - Sep 20 24:00 0 -
Rule Iran 2021 2022 - Mar 21 24:00 1:00 -
Rule Iran 2021 2022 - Sep 21 24:00 0 -

# Zone NAME STDOFF RULES FORMAT [UNTIL]
Zone Asia/Tehran 3:25:44 - LMT 1916
3:25:44 - TMT 1935 Jun 13 # Tehran Mean Time
3:30 Iran +0330/+0430 1977 Oct 20 24:00
4:00 Iran +04/+05 1979
3:30 Iran +0330/+0430

From the above lines I got the last Rule for DST changes is : "Rule Iran 2021 2022 - Sep 21 24:00 0 " and it is +0330/+0430.  So the new DST policy is not reflected in it.
Please let me know if I am making any mistakes .

Best Regards,
Vajiheh Bitarafan

On Tue, Apr 9, 2024 at 9:29 PM <brian.inglis at systematicsw.ab.ca<mailto:brian.inglis at systematicsw.ab.ca>> wrote:
On 2024-04-09 07:41, Vajihe Bitarafan via tz wrote:
> I am using some system and I encountered that in some situations Daylight Saving
> Time  is not working correctly.

Please contact your product support to update their time zone and summer
daylight saving time data as this has been known and available for 2 years.

> From 20 March 2023 , DST has been removed from government Policies and So from
> then there would not be any changes in Time. So Time zone Tehran/IRAN is +3:30
> for all days of the year.
> I hope it will be reflected in timezone databases and I can see the Joda time is
> updated respectively.

Updated in 2022b August:

https://mm.icann.org/pipermail/tz-announce/2022-August/000071.html

also in Joda-Time the same month:

https://www.joda.org/joda-time/changes-report.html#a2.11.0

and in other products within the year e.g. 2023 April:

https://techcommunity.microsoft.com/t5/daylight-saving-time-time-zone/iran-2023-time-zone-update-now-available/ba-p/3805707

--
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

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