POS Session Opening date is " 31-Dec-2013 10:11:12 " - After the sales we shop closed late night

The Session Closing time will be " 01-Jan-2014 02:15:05 "  And the next day is off , because its new Year

Accounts trying to post the entries on 02-Jan-2014 after verifying the cash balance and Sales

While posting acounting and stock entries will be generated on 02-Jan-2014.

Actually they want to show the sales as on 31-Dec-2014 and closing stock also effected as on 31-Dec-2014

We have introduced One more date in Session called "SALE DATE" , Irrespective of date of sales - Corresponding Entries will be generated on " SALE DATE:"  

But No Luck , Still its posting on the date of posting, Any One can help me to configure this