Are your Dahua IP Cameras always out an hour? Is the playback of footage not operating as it should or failing to load from the DMSS App? Check these settings to make sure your time & date have been set correctly for DST.
These settings are for UK & Ireland, your Daylights Saving Time will likely differ if you are located in another region, but determining your time zone will be simple enough.
Ideally this will all be set up on the initial configuration of your NVR/XVR and DMSS App, whereas this video shows this being applied after our recorder has been set up and added to the DMSS App.