Thanks for the heads-up. Here's a proposed patch, which I've pushed to github.
From d89986e3aa83a1e4db60012e322dd55d03c3ccd0 Mon Sep 17 00:00:00 2001 From: Paul Eggert <eggert@cs.ucla.edu> Date: Thu, 7 Mar 2013 14:12:38 -0800 Subject: [PATCH] Paraguay ends DST early this year.
* southamerica (Para): DST ends on March 24 this year. (Thanks to Steffen Thorsen). For now, assume the change is just this year. --- southamerica | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/southamerica b/southamerica index f77142e..9ef8b82 100644 --- a/southamerica +++ b/southamerica @@ -1567,6 +1567,15 @@ Rule Para 2005 2009 - Mar Sun>=8 0:00 0 - # ... Rule Para 2010 max - Oct Sun>=1 0:00 1:00 S Rule Para 2010 max - Apr Sun>=8 0:00 0 - +# +# From Steffen Thorsen (2013-03-07): +# Paraguay will end DST on 2013-03-24 00:00.... +# They do not tell if this will be a permanent change or just this year.... +# http://www.ande.gov.py/interna.php?id=1075 +# +# From Paul Eggert (2013-03-07): +# For now, assume it's just this year. +Rule Para 2013 only - Mar 24 0:00 0 - # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Asuncion -3:50:40 - LMT 1890 -- 1.7.11.7