Why is there no 3 1 every September?

Every September, the unprecedented number 3 1 in history. There are 365 days 12 months in a year, and only 1, 3, 5, 8, 10, 12 are big months, each month is 3 1 day, and 4, 6, 9,/kloc-. This is the law of ancestors in time, unchanged. It is also related to the running time and distance from the earth to the sun, and no one has changed.