There is a bit of a discrepancy when showing when a flag was submitted. A flag submitted yesterday does not show at what time it was submitted, it just states "yesterday".
Other, older, flags show the time, as well as the date.
Not sure if this discrepancy is due to the "Pending" status.
It would be nice if the time is shown.
Why? Because I was wondering whether I should reflag my question for migration (in case it had fallen down a hole, or been forgotten about), and wanted to know how much time had passed. I thought that I had actually submitted the flag two days prior, and comparing its response time to those of my previous flags, it seemed as if the pending flag was taking its time in being "seen to". However, I was unable to determine exactly how long the delay was, as the time is not shown. Minor quibble, maybe.
With respect to this question being a possible duplicate, yes, agreed it is the same issue, relating to the timestamp mechanism, although those two questions (1 and 2), relate only to questions/answers and make no explicit mention of the issue occurring with flags as well.
However, looking through the answers to the other question(s), I have just discovered that hovering provides the time stamp that I was looking for: