I will change my affiliation from University X to University Y in mid February, and I have got a paper accepted just before I move. The proofs will be sent back to the journal just a week before I change my affiliation.
Is it valid to use my new affiliation in the paper? This would be useful as it will count towards my publications in my new institution.
I have already signed a contract and will receive my new email address soon, however, my start date in my new affiliation is just a week after I submit the final version of the accepted paper.