We are getting that all put together - but it appears to be December 31, 2008
Check out FED - they have a 41% short interest!
I believe the dates are normally the 15th and the 30th - unless if the month ends with 31 days - then it is the 31st. If that day falls on a Saturday or Sunday - I believe they go to the prior Friday.
Everything I post - is my opinon - do your own due diligence before investing.