Suppose your birthday is a month b, then x = 3 1a+ 12b. Note that 12b is divisible by 12. We just need to divide X by 12, write down the remainder, and compare it with the following table to know its month A. If a = 1, then the remainder of 3 1a is divided by12 =. The remainder of 3 1a is divided by 12 = 93, the remainder of 3 1a is divided by 65433 and the remainder of 3 1a is divided by12 =10/If a = 6, then And the remainder of 3 1a is divided by 12 = 1 if a = 8, then 3 1a = 248, and the remainder of 3 1a is divided by 12 = 8 if a = 9, then 3/. And the remainder of 3 1a is divided by 12 = 3. If A = 18, then the remainder of 3 1a = 34 1 a is divided by 12 = 5. If a = 12, then 3 1a = 372, 3 1a divided by 12 and the remainder = 0, then (0 for example: 227 divided by 12 and the remainder =1/kloc. Date = (227-3 1 x 5)/ 12 = 6, so you were born on May 6th. 20 14-06-30 08:59:50 Supplement: If 3 1 is not used, other values than multiples of 12 can be used. Make the calculation room simpler, but the monthly comparison table will be reconsidered. ^^

Reference: knowledge

Do you want the rest? The remainder of 3 1 divided by 12 = 7.

Because the remainder of 3 1 = 12*2+7 62 divided by 12 = 2.

Because 62 = 12*5+2.