Why does my iMac stay in the year 2009

I have an iMac that consistently shows the year 2009 in the calendar and mail.  I've gone through two OS upgrades, but the problem persists.  It's stuck there. If I add a new iCal item it shows up on the 2013 calendar, but I cannot add dates for 2014.  It always shows 2009 in the Item Inspector entry year.  I cannot organize mail my the year because everything is posted as 2009.  Any suggestions?

To determine if you are seeing incorrect dates or times because of a custom date or time format:
Open System Preferences.
From the View menu, choose Language & Text (Mac OS X v10.6 or later), or International (Mac OS X v10.5).
Click the Formats tab.
Choose your desired region from the Region pop-up menu (any region other than Custom).
Quit the application where you were seeing incorrect dates or times displayed.
Open the application again, and verify that the dates and times are now displayed correctly.
More tips from this article!
http://support.apple.com/kb/TS3579

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