Is there a way to store password encrypted data along with a expiration date?

I think you answered your own question. You have to digitally sign the entire file including the expiration date, in order to protect the authenticity of the expiration date, even from users who have access to the password that can be used for decrypting the actual data.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.