"3 days ago" is not useful to me when I'm comparing dates.
I'd say it depends what you're doing. It's easier to compare lengths of time than dates - the difference between "3 days ago" and "5 days ago" is more obvious than the difference between "01/07/2015" and "28/06/2015". That said, if you want to know what happened on a specific date (eg commits that happened on 28/06/2015) then the time passed isn't useful. Ideally you should be able to toggle between the two.
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"3 days ago" is not useful to me when I'm comparing dates.
I'd say it depends what you're doing. It's easier to compare lengths of time than dates - the difference between "3 days ago" and "5 days ago" is more obvious than the difference between "01/07/2015" and "28/06/2015". That said, if you want to know what happened on a specific date (eg commits that happened on 28/06/2015) then the time passed isn't useful. Ideally you should be able to toggle between the two.