Exam Time not Consistent Across Participants

[Malekos74]

Describe the bug

On artemis, when one is going through an exam, the time left is shown on the top right of the screen.
During the "First Supervised Exercice of ITP", some students had a wrong time shown (60min instead of 90min)

When the 60min run out, the student gets forced to hand over his exam (Which shouldn't be the case since there should be 30 mins left)

To Reproduce

1. I still do not know how to exactly reproduce it.

Expected behavior

The time should be consistent across all participants at the beginning of the exam.

Screenshots

Note that refreshing artemis before the 60min timer runs out updates the counter and shows the correct time.

Which version of Artemis are you seeing the problem on?

7.7.3

What browsers are you seeing the problem on?

Chrome, Safari

Additional context

No response

Relevant log output

No response

[krusche]

We should really find out what caused this issue. This never happened before. Maybe some kind of edge case (e.g. editing the exam time shortly before the exam became visible) caused an issue.

[Malekos74]

@krusche I also would expect that the issue was caused due to editing the time. We should maybe contact the person in charge of creating the exam on artemis and ask about it. (I doubt that we, as outsiders, can find out what happened exactly)

[Malekos74]

Concerning the issue @HawKhiem mentioned:
I don't think that the problem that rose during the exam was caused by de-synced times in the personal computers of the participants because the only two possible time values they got was either 90 min. (Normal) or 60min. (Wrong time)

However, time calculation using server time sounds as an appropriate solution to me.

[badkeyy]

I am currently working on this. PR will follow soon

[krusche]

@badkeyy can you share what you found out?