exact
I thought the same thing, if you don't add the date this message doesnt make any sense
it could be a signed message that you stole some time ago
If you have the address, signing another message shouldn't be too complicated
True, it shouldn't be a problem for OP to signing a new message using same address won't be a problem if OP really owned the address which have been used before. The signed message as you have said could have been copied from somewhere. Providing a new signed message with date should be enough to prove the ownership of the account and op should be able to recover the account.