Cisco Call Manager Express giving out wrong time to phones

More useful info that hopefully pertains to your set up since I dont know what phones and ver. software you are using:

Configuring IP Phone Clock, Date, and Time Formats:
The Cisco Unified IP Phone 7970G and Cisco Unified IP Phone 7971G-GE IP phones obtain the correct timezone from Cisco Unified Communications Manager. They also receive the Coordinated Universal Time (UTC) time from the SRST router during SRST registration. When in SRST mode, the phones take the timezone and the UTC time, and apply a timezone offset to produce the correct time display.

Cisco IP Phone 7960 IP phones and other similar SCCP phones such as the Cisco IP Phone7940, get their display clock information from the local time of the SRST router during SRST registration. If the Cisco Unified SRST router is configured to use the Network Time Protocol (NTP) to automatically sync the Cisco Unified SRST router time from an NTP time server, only UTC time is delivered to the router. This is because the NTP server could be physically located anywhere in the world, in any timezone. As it is important to display the correct local time, use the clock timezone command to adjust or offset the Cisco Unified SRST router time.

The date and time formats that appear on the displays of all Cisco Unified IP Phones in Cisco Unified Communications Manager fallback mode are selected using the date-format and time-format commands as configured below:

SUMMARY STEPS
1. clock timezone zone hours-offset [minutes-offset]

2. call-manager-fallback

3. date-format {mm-dd-yy | dd-mm-yy | yy-dd-mm | yy-mm-dd}

4. time-format {12 | 24}

5. exit

One thing i know is when you look at the CCME GUI it actually shows you the time from your PC, therefore this is NOT the actually time on the CCME system.

To see the actual time on CCME, you should log onto the system either by telnet or console, and type #show clock. If the clock is 10mins out or whatever, just use #clock set 12:55:11 24 oct 2007, to set the clock manually. However if you use this method the clock will be reset everytime the router is restarted, therefore as the Warlock mentioned, it is best to sync with an NTP (network time protocol) server.

To set the clock on the router you just do it in enable mode (not config t) as seen below:

Router#clock set ?
  hh:mm:ss  Current Time

dcheest,

I know this question has been solved, but your solution was really a work around and not the solution.  There is a "clock set" command but many IOS versions has that command set in Privileged exec and not Global Config...

Router# clock set HH:MM:SS <day> <month> <year>
...
Then go into global config and set the timezone:

Router(config)#:  clock timezone <timezone label> -5   {whereas -5 is 5 hours behind UTC}
...
This would allow you to have the correct local time on ip phone and not have to rely on NTP or connection going down for time.

cheers.

rc