From the above thread:
"It turns out there is a bug in ruby 1.8.6 for 64 bit architecture.
And
guess what, the problem is with date. You can read more about the bug,
and the solution, here: http://redmine.ruby-lang.org/issues/show/1735.
"
Has anyone else seen this? I have a 32-bit processor, but I'm getting
it too.