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

Olson, Arthur David (NIH/NCI) [E] olsona at
Mon Jul 27 21:14:17 UTC 2009

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.


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 


My team has located and fixed an issue in the CLDR supplemental data for Windows TZ mapping.

Indiana (East) Mapping

1.         Change the Etc/GMT+5 type which seems spurious.
2.         Change the daylight flag.

<mapZone other="US Eastern Standard Time" type="Etc/GMT+5"/>
<!-- S (GMT-05:00) Indiana (East) -->

<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
Suite 711
Europort, Gibraltar
DD + (350) 200 78700 Ext7060
Mobile + (34) 687898027

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