Looks like calendar/libical/zoneinfo/America/Sao_Paulo.ics is wrong about when summer time starts which creates the issue. There is also a tzdata error fixed the new package available from Debian
** Changed in: evolution (Ubuntu) Sourcepackagename: evolution => evolution-data-server Importance: Undecided => Low Assignee: (unassigned) => Ubuntu Desktop Bugs Status: Unconfirmed => Confirmed ** Also affects: tzdata (Ubuntu) Importance: Undecided Status: Unconfirmed -- Wrong timezone in 2.8 (edgy) https://launchpad.net/bugs/67955 -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs