Andy Lipscomb has been added to the time zone mailing list; this message predates the addition. --ado -----Original Message----- From: Andy Lipscomb [mailto:AndyLipscomb@decosimo.com] Sent: Friday, January 20, 2006 12:39 PM To: tz@lecserver.nci.nih.gov Cc: ewwa@chattanooga.net Subject: Indiana time zones Actually, there are seven other counties that are moving from Eastern to Central time. Since they, like Starke County, do so at the time change, they will simply skip the spring-forward--2:00 EST and 2:00 CDT are identical (both equal 21:00 UTC on the previous day). It appears to me that this requires creating a new zone for the other seven counties, which I show below. # From J. Andrew Lipscomb (2006-01-20): # Department of Transportation ruling http://www.dot.gov/affairs/dot0406.htm # adds eight new counties to the Central (America/Chicago) zone. Six are in # the Evansville area, two near Chicago. One of them (Starke) already has its # own entry; as for the other seven, the largest city in them (and an old # territorial capital) is Vincennes. I suggest that for the exemplar city of # the seven counties. # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Indiana/Vincennes -5:50:04 - LMT 1883 Nov 18 12:09:56 -6:00 US C%sT 1920 -6:00 Indianapolis C%sT 1942 -6:00 US C%sT 1946 -6:00 Indianapolis C%sT 1955 Apr 24 2:00 -5:00 - EST 1957 Sep 29 2:00 -6:00 - CST 1958 Apr 27 2:00 -5:00 - EST 1969 -5:00 US E%sT 1971 -5:00 - EST 2006 Apr 2 2:00 -6:00 US C%sT In addition to the section above, the new zone will need to be added to the zone.tab file. Vincennes' location is +384042-0873058. And to cover Starke County: # From J. Andrew Lipscomb (2006-01-20): # The Department of Transportation placed Starke County back on Central time, # beginning at the 2006 DST start. # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER Rule Starke 1947 1961 - Apr lastSun 2:00 1:00 D Rule Starke 1947 1954 - Sep lastSun 2:00 0 S Rule Starke 1955 1956 - Oct lastSun 2:00 0 S Rule Starke 1957 1958 - Sep lastSun 2:00 0 S Rule Starke 1959 1961 - Oct lastSun 2:00 0 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Indiana/Knox -5:46:30 - LMT 1883 Nov 18 12:13:30 -6:00 US C%sT 1947 -6:00 Starke C%sT 1962 Apr 29 2:00 -5:00 - EST 1963 Oct 27 2:00 -6:00 US C%sT 1991 Oct 27 2:00 -5:00 - EST 2006 Apr 2 2:00 -6:00 US C%sT
From: Andy Lipscomb <AndyLipscomb@decosimo.com> Sent: Friday, January 20, 2006 12:39 PM
Thanks for doing all that work. As you can tell if you are reading the tz list, I was doing that work independently (and published it before seeing your email) but I double-checked my work by comparing it to yours. First, Shanks says Vincennes and Indianapolis differed in many ways before 1964. For example, he says Vincennes observed DST in 1946 and from 1956 through 1963. I assume you merely copied Indianpolis's table to Vincennes for time stamps until now, which wouldn't be quite right. Second:
In addition to the section above, the new zone will need to be added to the zone.tab file. Vincennes' location is +384042-0873058.
My proposed patch had +384038-0873143 which is fairly close. (The LMT figures also diverged, presumably because of the coordinate difference.) My latitude and longitude are from Shanks. I'm not sure how Shanks (or anyone else) decides where Vincennes "is", given that one arc second of latitude is only 31 meters or so.
participants (2)
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Olson, Arthur David (NIH/NCI) [E] -
Paul Eggert