sys-libs/timezone-data-2008 DST change for Argentina.
Wrong time zone from Oct 5. (GMT -2)
Argentinian law N° 25.155 is no longer valid.
The new one is law N° 26.350
So there is no summer time in Argentina for now.
See this bug in Debian
I don't know where to inform this to update tzdata & tzcode
the place to report these things is: firstname.lastname@example.org
*** Bug 242908 has been marked as a duplicate of this bug. ***