How to get date when port was added? To list ports added in last 1/2/3/.../X weeks?

[Ken Cunningham]

The Portfiles used to have the date they were added in the top line, which was handy to see if the port was ancient. This line was removed once macports moved to git, which was in a way too bad.

I use something like this (from the root directory of my git fork of macports-ports)

git log --pretty=oneline

or 

git log --pretty=oneline games

if I want to see just a certain directory