Wives are getting husbands to knock one before being called up. Home banking. Like that's gonna work. Guessing here... Your clue made me think...
16th September 2023 according to the oldest calendar still in use - the Jewish celebration of Rosh Hashanah. It falls at the start of the seventh month?
Not human made. It's a spacey wacey, timey wimey thing. Now't to do with Doctor Who though. A real actual thing.