Could you create a system which allows some encrypted messages to only be decrypted after/at a given time t and without any authority?
There would be so cool applications of such a system, imagine if someone (like Snowden) want to share to the world some important document but which only are auto-decrypted in the future, whatever happen to the person.
Do you think this will ever be possible? I'm afraid this need the time to be provable?
In your example you would be relying on a system clock in the end, which is easily manipulated. Better to use a trusted person or machine who can reveal the data or the key to the data at a given time, or to use a dead man's switch.