You're going to have to upgrade the firmware on the phones if I remember correctly. Default 4.0 didn't have the changes for the new DST change that took place in 2007, so the phones most likely think that DST has already ended.
See article below for additional information.
HTH,
Steve
ncorrect Time Stamp Appears During Extended DST
Daylight Savings Time (DST) changes in the U.S are mandated by U.S. Congress in the Energy Policy Act of 2005 (H.R.6.ENR), Section 110. The new U.S. DST standard is effective as of March 2007.
The operating systems of most Cisco products that support DST have built in mechanisms to automatically change the times. For Cisco Unified CME systems in the U.S. that have not been updated with the new U.S. DST policy changes, time stamps will exhibit a 1-hour time clock offset lasting three weeks beginning at 2 a.m. on the second Sunday in March and another 1-hour time clock offset lasting one week beginning at 2 a.m. on the last Sunday in October.
Step 1 For SCCP Cisco Unified IP Phone 7902G, 7905G, 7912G, 7920, 7921, 7935, 7936, 7940, 7960, and 7985G, modify the current default settings on the Cisco Unified CME router for the new U.S. DST standard by using the clock summer-time command.
Example:
Router# clock summer-time EDT recurring 2 Sun Mar 2:00 1 Sun Nov 2:00
Step 2 For SIP Cisco Unified IP Phone 7905G or 7912G, phone user can manually adjust time zone parameter by using the Settings>Network Configuration>Time Zone menu on the phone. For information, see the user documentation at http://www.cisco.com/en/US/products/hw/phones/ps379/products_user_guide_list.html
Step 3 For SIP Cisco Unified IP Phone 7940G and 7960G, update the phone firmware to 8.7(0). For installation information, see Installing and Upgrading Cisco Unified CME Software in the Cisco Unified CME Administration Guide.
Step 4 For Cisco Unified IP Phone 7906G, 7911G, 7941G/GE, 7961G/GE, 7970G, or 7971G/GE, update the phone firmware versions as follows. For installation information, see Installing and Upgrading Cisco Unified CME Software in the Cisco Unified CME Administration Guide.
•Cisco Unified CME 3.X, 4.0, and 4.0(X)-8.0(4)SR3 and 8.2(1) or higher versions.
•Cisco Unified CME 4.1-8.2(2)SR1 or a higher version.
Step 5 For Cisco Unified IP Phone 7931, update the phone firmware versions to 8.2(2)SR1 or a higher version. For installation information, see Installing and Upgrading Cisco Unified CME Software in the Cisco Unified CME Administration Guide.
Step 6 For Cisco IP Communicator, upgrade to CIPC version 2.0(2):
