Timestamps synchronization with local time

[mdabrowski1990]

From what I noticed, timestamp attribute of Message class uses time.time value. At the beginning of the communication with CAN Interface (I use Kvaser Hybrid CAN/LIN), the timestamps are synchronized with local time.time value. Over time the synchronization drifts.

My understanding is that:

• at configuration, local time.time value and ECU timstamp are synchronized
• then during runtime, CAN Interface's local time is used and no more synchronizations are performed
• over time local time.time value and CAN Interfaces time drifts and this is what I observe

My questions:

1. Is there any way to synchronize both local and CAN Interface clocks?
2. If synchronization is not possible, can I at least read the local interface time (it is enough for me to know the approximated drift value - 1ms tolerance is fine).
3. Is timestamp managed the same way by all interfaces, or does it depend on the type of interface I use?

PS. I am author of https://pypi.org/project/py-uds/ and I would love to know more to properly handle it in my project.