This is the kitchen calendar. It doesn’t show what day it is, but from the game dialogue “This month’s calendar. Today is the 13th.” we can tell that the story takes place exactly on a Tuesday, May 13th. Thus, the calendar reinforces the idea that the asylum was recently occupied. However, even though nothing specifically indicates the year, we can still speculate about it.
Conjecture about the year
Although the calendar doesn’t directly indicate the year, it gives us an important clue for that discovery. It has to be a year in which May starts on a Thursday and ends on a Saturday.
Considering that other elements suggest that the story is likely to take place between the 1920s and the 1940s, we have a few correspondences: 1924, 1930, 1941, 1947.