« first day (55 days earlier)      last day (2132 days later) » 

3:21 PM
I've added moderators to the post about history of MO. (In similar manner as they are listed in the post about history of MSE.)
I hope that I am not mistaken that the last elections were in June 2010, this tea thread seems to indicate so.
Feel free to edit this, correct any mistakes if I made some, put it into a separate answer if you prefer.
I did not list Anton Geraschenko descpite the fact he is listed among the mods, since it was mentioned on meta that he wants to step down.
Also I do not know the moderator history before 2010.
 
 
4 hours later…
7:26 PM
@MartinSleziak the last (before the current one) and I strongly believe only one, was the one you mention, where François G. Dorais and S. Carnahan got elected. Before that all the others were already moderators and I think (but am not certain) this was like this from the beginning on (at least very close after the beginning).
If one wants to be very precise, one could mention that Anton Geraschenko was not only moderator but administrator (two diamonds) before the move to SE 2.0, but maybe this is not necessary.
 
7:44 PM
@FrançoisG.Dorais not to be insistant but just in case my first comment from some weeks ago fell through the cracks: IMO could now be deleted, see here meta.mathoverflow.net/a/700/9072 for context
To be more specfici I created and also used a bit and for some elementary NT usages I added if feasiblae a more specific tag such a
 

« first day (55 days earlier)      last day (2132 days later) »