Update your system for new DST changes

mkdir tz

cd tz

wget ftp://elsie.nci.nih.gov/pub/tzcode2006p.tar.gz

tar -xzf tzdata2006p.tar.gz

zic northamerica

cp /usr/share/zoneinfo/America/Chicago /etc/localtime

zdump -v /etc/localtime |grep 2007
(if the date is March 11 and not April, then it worked).

shutdown -r now