I just purchased a EVGA GTX 770 on July 30th, 2014.
When I registered my graphics card on the EVGA site, I accidently put "August" instead of "July". There appears to be no way to change it.
I have purchased the extended warranty and filed a Step-Up request, complete with my Amazon invoice and everything else required.
I'm afraid my mess up with the register date is going to hamper my step-up, do you think this could be an issue? Thankfully both dates are within the 90 day range, which is why I'm hoping I'm okay.