I have completed the test on all NVRs with the Tp series cameras. So far time is kept in sync with the NVR as long as the GMT on Both NVR and cameras are set as GMT+8 and the time is set at the NVR manually. The default GMT in the TP cameras is set to GMT +8. You CANNOT have NTP setup in the NVR if there are going to be TP cameras connected though otherwise the time will be an issue. Lastly, you can setup DST instead at the NVR level so the time changes automatically when dst occurs.