@Solla-topee thanks for unlocking this now older thread.  I happen to be visiting the location where I originally reported the issue, and had time this weekend to investigate while the UK is in DST.

At first, I thought with new firmware updates, on both the NVR and Tapo devices, that all was fine.  However, not long after I spotted the time on the C100 was once again an hour ahead of DST.  Interestingly, the C110 is fine now.  Given both cameras are on identical setup i.e. same router, network, NVR, etc. I can only differentiate by the camera unit being the root cause.  Note, I also tried again turning off time sync from NVR to both C100 and C110, but the issue persists with C100.

• At time of writing, firmware versions are, C100: 1.1.15, C110: 1.3.0
• As requested attached are screen grabs, all taken within one minute, of the time on C100 (incorrect), C110 (correct) and local time in DST/BST
• Finally, I did enable diagnosis mode on the C100 and the log captured the issue occuring.  I unfortunately need to get the file (saved on another computer) and post, but there wasn't an obvious failure I spotted.  There are references to time being updated on BusyBox.  Maybe you can make sense of it when I post back

Time:

C100:

C110:

  @Solla-topee 

> Since the cameras' time is correct on the Tapo app, the problem may be on the NVR settings

But the time isn't correct in the Tapo app.  Can you see the photos I attached in my last post, which were taken from Tapo app. The C100 is 1 hour out, where as the C110 is correct.

> May I have the pictures of each camera's Date and Time settings page on the NVR for further analysis?

There isn't one.  There is one global setting on the NVR for specifying an NTP server (which is set), then there is an option per camera to sync with the NVR or not.  Currently time sync with C100 is off

> And what's the model of your NVR and its software version?

Hikvision 7608ni-i2, on latest firmware

Hey  @Solla-topee ,

> If they have the same time zone but the time on the live view page is different, please let me know the model number and OS version of your phone, and the version of the Tapo app for further analysis.

Yes, that is the case.  Time zone for both cameras is set to "UTC-00:00 London/Europe", but the time is different.  OS is android 11. Tapo app is 2.15.112.

To be clear, the timestamp is encoded into the camera live view stream.  It appears in the live view of the NVR also, so it cannot be my phone/tapo app that is adding incorrect time.

For anyone coming across this.

Tapo support were fantastic.  Worked through the solution after I provided logs from my camera.  They found an issue with the time synch implementation and my NVR, and pushed a beta firmware to my C100 which has since resolved the problem.

How this will make it into master i.e. production firmware is TBD, but for now my camera time is matching the C110 and the NVR.

Well done Tapo for great customer support.