I currently have a HDBW4431RZS camera I am using with an Amcrest NV4180 (I think this is re-branded Dahua NVR). The NVR is set to use DST and NTP, the cameras are all left at default (sync to PC). The cameras all accept the NVR time, and I have had no problems with DST. I purchased my Dahua camera from X-ElectronicS, an Amazon reseller. Different sellers may be selling differently configured cams? I may find out soon, as I have another of these cameras on order from an Ebay seller in China. My camera is using 2.420.0.21 firmware version, if it matters.