Do people really want date and time on the forum?
I am not sure the average user does use it.
I noticed that it was part of every page on the forum in the past (maybe part of the default).
I know I have referred to it when the page time was not in the same time zone as myself.
I found it useful when looking at situations of necromancy.
I found it handy when looking at the profile of another member (for instance checking with register date or last active date).
And, there were times I referred to it that I can not now remember why, but it made it easier to have it handy.
As for the average user I am not sure.
Did the original designers of the forum software see a need?