To find the divisor of 12, we only need to look at the last two digits of the year. The answer is the largest whole number that can evenly divide this two-digit number. Any number less than 12 cannot divide it, so the answer is 0. For the year 2023, the answer is 1, because 23 can only be divided by 12 once.
Examples of years and their Divisor of 12: