Issue with the Date in invitation letter

[dam4]

I am going to attend the B1 visa interview next week. I have the invitation letter from my client company. But when I got the invitation letter, there is no interview slots available and the dates in the invitation letter is already passed. Will that be an issue? This is my first visa interview.

[aanuaanu2011]

I am in a really bad situation now. The Date of birth in my birth certificate(aug 1981) is different from the date of birth given in all other documents (ie school certificate, passport, marriage certificate- all these documents my DOB is May 1981). Since my birth is registered the corporation wont...