Thank you for the compliments @izaychik63. I have made a few remarks about date and time variables in the other thread and provided some links:
Could you give an example. I think the seconds should be stored it might just be that they are not immediately visible. You could check using the Extract Date&Time Fields node.
What you could also do is just use Java code to create Date and Time variables and also manipulate them:
And then about the guessing and the week-based year. From your screenshot and what I tried I see the red warnings around Time and Date and the execution would not immediately give a result, though it would let me extract a time.
So the recommendation still stands to use extra caution with all things relating to date and time (and timezones), err on the save sind, read the documentation and test fringe cases. And if you transfer date and time variables from external sources do it as string or ‘readable’ numbers - or establish a single source of truth by using just one data storage like KNIME table, Parquet or H2 or SQLite databases (they all come with their own set of quirks concerning date and time variables)