Or like this:
http://z.iwethey.org/forums/actions/forum/markForumRead?forumid=3&markstamp=2006-01-12+12%3a00%3a32-05
http://z.iwethey.org/forums/actions/forum/markForumRead?forumid=3&markstamp=2006-01-12+11%3a00%3a32-05
or:
[link|http://z.iwethey.org/forums/actions/forum/markForumRead?forumid=3&markstamp=2006-01-12+12%3a00%3a32-05|Mark Read]
[link|http://z.iwethey.org/forums/actions/forum/markForumRead?forumid=3&markstamp=2006-01-12+11%3a00%3a32-05|Unmark Read to an hour before the other link]