The original problem was for first and second generation phones:
http://www.cisco.com/en/US/customer/ts/fn/632/fn63213.html
Cisco Unified Communications Manager does not send Daylight Saving Time updates for Time of Day routing (ToD) and for these Cisco IP Phone models: CP-7905, CP-7910, CP-7912 CP-7920, CP-7921, CP-7925, CP-7935, CP-7936, CP-7937, CP-7940, CP-7960, CP-7985
1. Which firmware those phones are using?
2. Whats the time of the cucm server?
2a Using NTP
3. Only new phones, and existing ones show correct time?
Thanks