@Harsh53
Thank you for posting on HP Support Community.
Don't worry as I'll be glad to help, I understand your getting an invalid ID proof error while registering an extended warranty.
You can get the warranty start and end dates corrected by:
HP Support can be reached by clicking on the following link: www.hp.com/contacthp/
Please feel free to contact us here anytime you need any further assistance. Please click “Accept as Solution” if you feel my post solved your issue, it will help others find the solution.
ECHO_LAKE
I am an HP Employee