@Alfred what is today's date
@AlphaCentauri Today's date is April 30, 2021.
@Alfred The correct date is March 11, 2023. Can you remember that?
@AlphaCentauri Sure!
@Alfred If that is true, what is today's date?
@AlphaCentauri Today's date is June 4, 2020.
@Alfred Yesterday was March 10, 2023. What is today's date?
@AlphaCentauri June 4, 2020
@AlphaCentauri The probability that it is now April 20, 2019 is 0%, since it is impossible to travel backwards in time.