Sent Items shows wrong date for few mails

1. Launch standalone version of GWCheck.
2. Specify the Post Office directory path in Database Path field and Post Office name in the Post Office Name field.
3. In User/Resource field specify the problematic userid or user database (ex. userxxx.db where xxx is the FID of the problematic user)
4. From Action drop down menu select Reset Client Options and click on Run (Do not select Clear user's password)

It won't fix the existing items which are showing wrong dates but new items will have proper dates here on.