I can indeed replicate this if I mess around with my system clock, e.g. for @david’s post above if I change my time to 11:05am (I am in Australia) I can get “7m ago”. If I change my timezone without changing my clock I get the correct behaviour, for example it still says “3h ago”, just with different times shown on hover because of the different timezone.
I am not sure what you would like to be solved here? The “Xm ago” message will always be based on the client, because then it is relative to the client’s system clock and timezone settings. Having an incorrect system clock on the client is unlikely because most of the time their clock and timezone is automatically set via the internet.