Cisco Unified IP Phones 7900 Series

September 7, 2007

NOTICE:

THIS FIELD NOTICE IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTY OF MERCHANTABILITY. YOUR USE OF THE INFORMATION ON THE FIELD NOTICE OR MATERIALS LINKED FROM THE FIELD NOTICE IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS FIELD NOTICE AT ANY TIME.

Products Affected

Problem Description

The operating systems of most Cisco products that support Daylight Saving Time (DST) have built-in mechanisms to automatically change the times, based on current user-selected rules. Once the new DST is implemented, the time on devices that maintain time zone information will continue to change according to the old method, unless changes are made.

Background

On April 30, 2007, the Minister of Internal Affairs issued a statement regarding a change in Daylight Saving Time policy for New Zealand. The change in policy has modified the start and end dates for Daylight Saving Time (DST). Beginning in 2007 and beyond, Daylight Saving Time in New Zealand will start on the last Sunday of September at 2:00 A.M. local time and end on the first Sunday of April at 3:00 A.M. local time.

Specifically for 2007-2008, Daylight Saving Time will begin at 2:00 A.M. local time on September 30, 2007, and end at 3:00 A.M. local time on April 6, 2008.

For more information, see the statement issued by the Minister of Internal Affairs: Daylight saving to be extended.

The old Daylight Saving Time policy dictated that DST started on the first Sunday in October and ended on the third Sunday in March.

On April 30, 2007, Hon Rick Barker, Minister of Internal Affairs, announced a three week extension to the period of daylight saving. Daylight saving now runs from the last Sunday in September until the first Sunday in April.

Table 1 - Summary of changes to Daylight Saving Time

Problem Symptoms

The potential problem is that the system time and all timestamps will be incorrect by an hour for three weeks in the spring and one week in the fall for the year of 2007 and beyond, unless the steps described in this notice are taken.

This can have a major impact on any event correlation activities that are performed as part of normal operations, troubleshooting, and monitoring.

For example, applications where logs may be captured, correlated, and stored could be rendered incorrect for situations where they need to be recalled to rebuild a sequence of events. The incorrect timestamps may not be an issue for events that get immediate action, but future reference back to these events would reference incorrect times.

In addition, any device with time based controls and activities, such as authentication servers, synchronization activities, and scheduled events such as batch jobs, timed backups or automated scripts would be impacted.

Workaround/Solution

To comply with this government mandate, Cisco has begun to take the necessary steps to conform to the new New Zealand Daylight Savings Time standard that will begin in September 2007.

The intent of this document is to inform Cisco customers of the plan that Cisco is preparing in order to bring the Unified Communications applications and associated platforms into compliance with this new government mandate.

Important Note

For instructions on DST upgrades needed for the Cisco Unified Communications Manager, refer to:

Field Notice: FN - 62883 - New Zealand Daylight Savings Time Policy Changes Effective September 2007 - for Cisco Unified CallManager.

For instructions on DST upgrades needed for Cisco Unity, refer to:

Field Notice: Field Notice: FN - 62868 - New Zealand Daylight Savings Time Policy Changes Effective September 2007 For Cisco Unity.

DDTS

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Revision History

For More Information

If you require further assistance, or if you have any further questions regarding this field notice, please contact the Cisco Systems Technical Assistance Center (TAC) by one of the following methods:

• Open a service request on Cisco.com
• By email
• By telephone

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