iPhone displaying incorrect email receive date

Forgive me if I have posted in the wrong community, however this is my first post. My iphone 4 (iOS 6.0.1) has recently (over the past three days) started sporadically assigning a xx/xx/00 date to emails rather than xx/xx/12. When I open the email the date is the current date, but the receive date is not. Not all emails display the wrong receive date. My husband's iphone 4 has also started doing the same thing today; I'm not sure if it is specific to 4s or if other iphone models are also experieincing this problem. I also don't know what is causing this, and therefore how to fix it, but I would appreciate any advice or solutions from others who may have had this problem.