Show the finished timestamp when cell finish running

[rchiodo]

Discussed in #9498

^{Originally posted by amssljc March 26, 2022}

[andreaschiappacasse]

+1 on this issue, maybe i'd prefer to be able to see the "start time" instead of the "finish time", so that it could be added to running cells as well (even if it's trivial to get the start time in that case from the ongoing duration).

e.g. something like:

I see that it was originally discussed in #1454, when a timestamp was mentioned along with the total duration, I presume it was discarded to avoid adding too much text below the cell, maybe this could be enabled via settings and disabled by default?

[rchiodo]

@andreaschiappacasse Would you want this start time/finish time always displayed, even when opening the notebook somewhere else?

Meaning the finish time would be saved in the notebook metadata?

[andreaschiappacasse]

@andreaschiappacasse Would you want this start time/finish time always displayed, even when opening the notebook somewhere else?

Meaning the finish time would be saved in the notebook metadata?

Given that the execution time is not currently stored in the notebook, I wouldn't expect this kind of information to be stored either (and it's not needed in my daily use), but I do think it would be a nice feature.
It could be usefuI in some cases to be able to see when a notebook was run last and how long it took.

In that case, it could be nice to be compliant to what this extension does, as in saving it as:

{
    "ExecuteTime": {
        "start_time": "2016-02-11T18:51:18.536796",
        "end_time": "2016-02-11T18:51:35.806119"
    }
}

So that opening the notebook in jupyter (with that extension enabled) could recover the timings.

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On the other hand, if persistence is really needed in one's use case, it is easy to add some timing functionality to the cells output. So I would be equally happy with a solution mimicking the current "execution time" implementation.

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To build on the idea, UI wise, another, maybe cleaner (?), solution, could be having the starting or/and finishing time to be displayed on mouse over on the execution time. In this way, the current UI would stay untouched but timings could be easily recovered as well.

[DonJayamanne]

Closing as a duplicate of microsoft/vscode#168792