Indiana (East) has no DST set in CLDR supplemental data

Mark Davis ⌛ mark at
Mon Jul 27 22:07:49 UTC 2009

Thanks for bringing this to our attention. Searching in for
"GMT+5", I see:

*a windows mapping*
<mapZone other="US Eastern Standard Time" type="Etc/GMT+5"/>

>From the statement, it looks like the issue is with this line. I believe
that this was touched relatively recently by a Microsoft engineer. The
actual data is just mapping the windows ID "US Eastern Standard Time" to the
TZDB ID "Etc/GMT+5". I'm not sure what "Change the daylight flag." means,
since there is no daylight flag associated with Etc/GMT+5. But I'm not an
expert on this area, so I'll forward to people who are more conversant.

The item about Indiana is just a comment, and does look spurious: <!-- S
(GMT-05:00) Indiana (East) -->.


P.S. Note: there are other items mentioning GMT+5, but I think they are not

*a zone item (territory and alias)*
<zoneItem type="Etc/GMT+5" territory="001" aliases="EST SystemV/EST5"/>

* a short-id mapping*
<typeMap type="Etc/GMT+5" bcp47="utcw05"/>

On Mon, Jul 27, 2009 at 14:14, Olson, Arthur David (NIH/NCI) [E] <
olsona at> wrote:

> As Ian Davies observed, CLDR data is supplemental--not part of the time
> zone package. That being said...
> "Etc/GMT+5" would have been correct for much of Eastern Indiana through
> 2006 since DST wasn't observed.
> (Recall that there's a UNIX-heritage GMT offset sign reversal; use the
> commands...
>        TZ=Etc/GMT+5 date
>        TZ=EST date
>        TZ=EST5 date
> see that Etc/GMT+5 used to be the right thing.)
> Perhaps this particular CLDR data hasn't been updated since 2006.
>                                --ado
> From: Ian Davies [mailto:iand at]
> Sent: Monday, July 27, 2009 5:35
> To: Olson, Arthur David (NIH/NCI) [E]
> Cc: Ian Davies
> Subject: Indiana (East) has no DST set in CLDR supplemental data
> Hi,
> My team has located and fixed an issue in the CLDR supplemental data for
> Windows TZ mapping.
> Indiana (East) Mapping
> Changes...
> 1.         Change the Etc/GMT+5 type which seems spurious.
> 2.         Change the daylight flag.
> Original...
> <mapZone other="US Eastern Standard Time" type="Etc/GMT+5"/>
> <!-- S (GMT-05:00) Indiana (East) -->
> Updated...
> <mapZone other="US Eastern Standard Time" type="Indiana (East)"/>
> <!-- D (GMT-05:00) Indiana (East) -->
> Could you verify?
> Regards, Ian
> Ian Davies
> Manager, Internationalisation & Multilingual
> PartyGaming
> Suite 711
> Europort, Gibraltar
> DD + (350) 200 78700 Ext7060
> Mobile + (34) 687898027
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