Great, I’m actually about to start working on the same (opened a similar topic Danfoss Ally weekly schedule)
I’m using ZHA but you can check the internal time by querying cluster 0x000a and attribute 0x0000. This value can according to [1] both be read and written. The value stores:
This cluster provides a basic interface to a real-time clock.
The clock time MAY be read and also written, in order to
synchronize the clock (as close as practical) to a time
standard. This time standard is the number of seconds
since 0 hrs 0 mins 0 sec on 1st January 2000 UTC. [1]
I will probably set up an automation script to once daily update the timestamps of the TRVs.
[1] https://assets.danfoss.com/documents/193613/AM375549618098en-000102.pdf