This hint in the Game, „the DAY is the KEY“, is clear but could be confusing at the same time!

1.) The letter-code does not include the day!
2.) The day is the starting point and the letter above allways the number 0!
3.) The Tatoo looks like a clock so the code goes clockwise!

Fully DECODED

Day 24
A=0 / F=1 / I=2 / G=3 / J=4 / B=5 / D=6 / C=7 / E=8 / H=9

Day 31
I=0 / G=1 / J=2 / B=3 / D=4 / C=5 / E=6 / H=7 / A=8 / F=9

Day 3
J=0 / B=1 / D=2 / C=3 / E=4 / H=5 / A=6 / F=7 / I=8 / G=9

Day 10
D=0 / C=1 / E=2 / H=3 / A=4 / F=5 / I=6 / G=7 / J=8 / B=9

Day 17
E=0 / H=1 / A=2 / F=3 / I=4 / G=5 / J=6 / B=7 / D=8 / C=9



Examples
Game 1 – 31.12.1792 = G J G H G J
Game 2 – 17.01.1793 = E H H B C F
Yesterdays Date - 31.06.2022 = I E J I J J


Solution
The right „Code“ for the 24.01.1793
= = A F F C H G = =
The right „Stamp“!
The middle one with the inscription "Floret in Domo Domini"


Final Word´s
I hope this short guide was helpful!
GL HF anytime!