The windows altered the clock because of the summertime, however it is wrong this hour. I canceled the option in the windows and I corrected the hour, but the telephones 7912/7940/7960 don't accept, only the 7970. What can be?
When you update the windows time the update takes a while to flow out to all the phones depending on whether the phone is registered to the Pub or Sub(s).Have a look at the following doc that has great CCM Time sync ideas;
How To Configure Time Synchronization for Cisco CallManager
From this doc that describes using NTP,Net Time and W32Time;
Hope this helps!
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We just have Pub. The onlooker is that the 7970 and IP Communicator are with the correct hour but the others 7912/7940/7960 not. I believe that the file TFTP for them to be different.