If you were to guess a 12-digit hexadecimal hash, it's about 1 in 281 trillion that you will get it right. I believe a time traveler should be able to do it.

printf '%s' '2027-09-27 9:00:00 PM 87C-6DD-49E-EF8' | openssl dgst -sha256 | cut -d' ' -f2 | cut -c1-12.

For an example, let's say now you are 50 years old in this year 2026. Time Travel back means you only can travel back till 1976. Because before 1976 you don't even born yet come to this world. Next if go back lets say back to 80s. You will be 50 years ? see yourself in younger days? Or in person ? If so you will not be 50 years old. You will be back to just 8, 9, 10 years old depend which year you plan to go in 80s.

Whereas for Time Travel to the future, You don't even know which year you will RIP.