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 ...to 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@PartyGaming.com] 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. http://unicode.org/cldr/data/common/supplemental/supplementalData.xml 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 This email and any attachments are confidential, and may be legally privileged and protected by copyright. If you are not the intended recipient dissemination or copying of this email is prohibited. If you have received this in error, please notify the sender by replying by email and then delete the email completely from your system. Any views or opinions are solely those of the sender. This communication is not intended to form a binding contract unless expressly indicated to the contrary and properly authorised. Any actions taken on the basis of this email are at the recipient's own risk.