interpretation of Rule
Garrett Wollman
wollman at csail.mit.edu
Fri Feb 4 21:17:49 UTC 2011
<<On Fri, 4 Feb 2011 14:54:21 -0500, <mxtaylor at ups.com> said:
> Sorry I am also new to this and am trying to understand how the rule below is applied:
> # Ghana
> # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
> Rule Ghana 1936 1942 - Sep 1 0:00 0:20 GHST
> Rule Ghana 1936 1942 - Dec 31 0:00 0 GMT
> I read it as "Ghana" rules were only in effect from 1936 to 1942.
This is a common confusion. The Rule statements generate transitions;
in this case, every year between 1936 and 1942, two transitions are
generated, one from GMT to GHST (save 20 minutes), and one from GHST
to GMT. Since no transitions happen after December 31, 1942, Ghana
remains on GMT.
-GAWollman
More information about the tz
mailing list