I double checked, there is no problem with date/time group config. Since today is no longer summer time, the time on ip phones are correct. But I think it will be a problem since next summer time begins.
Make sure that "Automatically adjust clock for daylight saving changes" is checked Under Date/Time Properties -> Time Zone on your CallManagers. Double click the clock in the system tray to get to this setting.
Keep in mind the phones clock off the server they are registered to. If you are looking at the time on the publisher, perhaps the phones are regestired to a subscriber and a time setting is messed up on it.
I have seen a lot of issues like this in 7970 phones. There was a bug filed for this and the latest phoneload for 7970 solves this. But, in those days when we didnt have this phoneload, we used to create a date/time group and put it in a time zone which was in the time that my phone was displaying - like, say my phone is 5 hours behind the correct time. So, I will create a date/time group which is 5 hours ahead of my correct time zone, and then assign this date/time group to the device pool where the phones are having the time issue.
I think you can also do this and this will really work. Let me know incase of any issues.
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