>North American Daylight Saving Time Changes
North American Daylight Saving Time Changes

North American Daylight Saving Time Changes This Year

The U.S. Energy Policy Act of 2005 changes the dates for switching to and from Daylight Saving Time in North America beginning this year.

Unless your operating system is up-to-date, any application that date- or time-stamps files, emails, or transactions may not function properly.

Beginning in 2007, Daylight Saving Time (DST) will start at 2 am local time on the second Sunday of March, instead of the current rule of the first Sunday of April. DST will end at 2 am on the first Sunday of November instead of the current rule of the last Sunday of October. These date changes affect all United States and Canadian time zones that implement DST.

Daylight Saving Time Begins Daylight Saving Time Ends
2nd Sunday of March 1st Sunday of November

These new rules require changes to your operating systems so that the systems continue to function properly past these dates. Potentially, some of your applications will also need to be updated to accommodate these rule changes.

Cameron Haight, a Gartner Inc. analyst who has studied the potential effects of the daylight-saving bug, said that if not fixed it might force transactions occurring within one hour of midnight to be recorded on the wrong day. Computers might serve up erroneous information about multinational teleconference times and physical-world appointments.

"Organizations could face significant losses if they are not prepared," the Information Technology Association of America cautioned this week.

More information was published recently by the Associated Press HERE.

Xinuos Operating Systems and Daylight Saving Time Changes

Patches to Xinuos systems are available for the following current and recent operating systems.

Current Operating Systems Free Patch Available
UnixWare 7.1.4 YES. Click Here
OpenServer 6.0 YES. Click Here
Recent Operating Systems Free Patch Available
UnixWare 7.1.3 YES. Click Here
OpenServer 5.0.7 YES. Click Here

Older Unsupported Xinuos Operating Systems and DST

Customers running the following Xinuos operating systems:

  • OpenServer 5.0.6 or earlier
  • OpenUnix 8.0.0 (UnixWare 7.1.2)
  • UnixWare 7.1.1 or earlier
  • OpenServer 3.0 or earlier
  • OpenDesktop 3.0 or earlier
  • Unix 3.2v4.2 or earlier
  • Xenix 2.3.4 or earlier

and who wish to update their systems to address the DST issue must upgrade to one of the supported Xinuos operating system releases above.

In the event that you are unable to perform upgrades within the specified time line, Xinuos offers custom patches and solutions through its Professional Services division.

For information on upgrades and Xinuos Services please contact Xinuos Inside Sales at (800) 726-6561.

Further Information

2007 North American Daylight Saving Time Supplements

For more information on DST and Xinuos operating systems please search the Xinuos Knowledge Base at:


using the keyword dst.

For more information on the support status of Xinuos products and upgrade paths for unsupported products please see:


For further information on DST please see:


For further information on U. S. time zones please see: