Weird dates... "today" is wrong date --> 2059, 2084 etc.!
 

I'm using OF 1.7.5 on Mac OS X 10.6.1 on a MacBook Pro (17").

When I try to set the date for any task, I get some pretty nonsensical values filled in for me. For example, when I type in "today", the date value filled in is not today, but April 13th, 2059. When I click on the little calendar icon, it actually indicates May 5th, 2084.

When I type in "3/11/09" (minus quotes), I get April 13th, 2059, as above. When I type in "11/3/09" (minus quotes), I get Dec. 17th, 2076. When I click on another application and then return to that same input window, it then says Sep. 30, 2091.

My computer's own clock and calendar display the correct time and date, and the Mac is set to set the time automatically, using the Apple Europe time server (I'm in Ireland).

What could possibly be causing this?

Any advice would be greatly appreciated,

electroglodyte