To calculate the modulo of 12, we also focus on the last two digits of the year. The result is the remainder when the two-digit number is divided by 12. If the number is smaller than 12, the modulo is the same as the number itself. For the year 2023, the modulo is 11, as 23 divided by 12 leaves a remainder of 11.
Examples of years and their Modulo of 12: