Heist of Fort Knox

You choose to hide in the bathrooms. Some guards come into the bathroom to check to see if any tourists are left in it. They only open the door and they don't check in any of the stalls. You hide in the stalls and raise your feet off of the ground so that the guards don't see you. After about 1 hour of hiding, you leave the bathroom and go to the suspicious rock that you see earlier, and you hear no one, so you think that the guards have already left. You make it to the rock to investigate. You look at all 4 sides of the rock and you see a very small keypad on the lower half of the left side of the rock. You look at it and it is a 4 digit number lock. If you get the number wrong, you will probably end up in jail because someone will find out. You think of all the dates that you remembered in the tour and you remember the three significant ones. The building year, which was 1918. The year it was first called Fort Knox, which was 1932. The year that they named it training grounds was in 1925. All of these dates could be the code to unlock the hidden maze. You also get scared on the idea that you may get caught if you put in the wrong code, so you can also choose to leave the fort. Which one do you choose?