It was a Time-Turner experiment
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Near the midde of last year everyone here was given a Time Turner and turned it 11865 times (it took a bit of effort couting how many times the Turner had been turned - some people got a bit carried away and when they came out, the muggles hadn't even invented their tillyvision contraption). Most of us came out at the start of 1970 though, which is the reason for the unusual dates.
There's another version of the story that goes along the lines of "Well, it was a PHP programming issue when the board was upgraded in the middle of last year. Unfortunately a lot of boards reported similar problems as the upgrade itself was pretty horrendous. The entire upgrade itself took about 16 or 18 hours of non-stop work, with a whole load of manual tweaking of the database until it eventually got to work, but the dates of postings prior to the upgrade all defaulted to the same date. I'd considered trying to recover the dates at the time but with the problems I'd had getting the upgrade to work, I was slightly scared to change anything further and folks here said they weren't worried too much about the dates of the earlier posts really." ... that's the, err, official version of the story to hide the real reason
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