Data Center Works Inc

Daylight Savings Time Changes

• This spring, Canada is following the U.S in starting daylight savings time on March the 11th instead of April 1st, and ending it on November 4th instead of October 28th.
• The changes required for any version of Solaris, and in principle any other machine with zic and zdump, are
  • Download the northamerica zoneinfo file from the Open Solaris site as /usr/share/lib/zoneinfo/src/northamerica.2007
  • As root, run
    # /usr/sbin/zic /usr/share/lib/zoneinfo/src/northamerica.2007
    # /usr/sbin/zic /usr/share/lib/zoneinfo/src/backward
  • Test it with
    $ zdump -v Canada/Eastern | grep 2007
  • If the dates are Mar 11 and Nov 4, it worked.
    If they are still April 1 and October 28, it didn't.
  • Optionally go back to the 2006 settings with
    # /usr/sbin/zic /usr/share/lib/zoneinfo/src/northamerica
    # /usr/sbin/zic /usr/share/lib/zoneinfo/src/backward
• Thanks and a tip of the hat to rweeks of the Open Solaris sysadmin forum for the "zic backward" line above which made the changed time zones work.