I use the GXP 2000 and have had no issues with them keeping the correct time. I run my own NTP server and point the phones to that source. As I stated, this is working very well for us. A couple of simple things that I would suggest you check:
1) On the Basic tab make sure that you are setting the phone to the correct time zone. 2) On the Basic tab set the "Allow DHCP Option 2 to override Time Zone setting:" to No unless you are specifically using this with your DHCP server. 3) Verify that the Daylight Savings Time is set appropriately for your location on the basic tab. 4) On the Advance tab set the "Allow DHCP Option 42 to override NTP server:" to No. I hope this helps you out.
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