Upcoming Indiana time zone moves

Olson, Arthur David (NIH/NCI) [E] olsona at dc37a.nci.nih.gov
Thu Jan 26 15:32:35 UTC 2006

When a mountain-to-central change occurs as DST ends, the destination
(central) time zone is already out of DST at the instant when the
transition occurs; things get handled correctly without any special
casing (take America/North_Dakota/Center, please.)


-----Original Message-----
From: Andy Lipscomb [mailto:AndyLipscomb at decosimo.com] 
Sent: Thursday, January 26, 2006 10:03 AM
To: tz at lecserver.nci.nih.gov
Subject: RE: Upcoming Indiana time zone moves

+ .PP
+ If,
+ for a particular zone,
+ a clock advance caused by the start of daylight saving coincides with 
+ and is equal to a clock retreat caused by a change in UTC offset, .IR 
+ zic produces a single transition to daylight saving at the new UTC 
+ offset (without any change in wall clock time).

Can this be implemented also for the opposite case (daylight savings
ends, but the offset is advanced)? This was the case with the M->C
changes in the Dakotas.

More information about the tz mailing list