Feature request for shorter relative date format in log

Hello there,

I usually use --date=relative in git log, but I find it can be shorter to save more space and be more efficient. 

First, the trailing “ago” can be removed, because it seems every relative date has a trailing ago. Second, the seconds, minutes, hours, days, weeks, months, and years can be shorten to a single letter (e.g., s, m, h, d, w, M, Y), and the suffix “s” for plural can also be removed in this case. Maybe it will be better to give us a way to customize it, or create a new to config like --date=relative-short.

I apologize for any inconvenience since it’s my first time to use a mailing list.

Thanks.