cisco ip phone time

[mojtaba961]

hello
i don't know why some phone in my VoIP system get different time with my call manager
my call manager version is 7.1
and i have 2 kind of Cisco Ip phones 7911 and 7945
7945 phones get wrong time with 1 hour difference
Thank in advance

 

[Textron68]

Time zone settings are in the Device Pool the phone is assigned to. Start there.

 

[mojtaba961]

thank you Textron68
but both of phones are in the same device pool, but 7911 get right time and 7945 get wrong time(with an hour difference)
my problem is establish yet,
Thank in advance