We kinda overdid it with #206 #210, now it says things like "3 months ago", but is it 90 days? 110 days? Impossible to tell.

Maybe we should do something like a timestamp with a vague human thing in parens, or never let it go above days?

Mayhaps:

/uptime
-> 4 hours, since 2017-08-14T02:34:56

/uptime
-> 157 days, since 2017-08-14T02:34:56

If not just the days bit.