1, subtract 1900 from the year to be calculated, and record the difference as n;

2. Divide n by 19 and record the remainder as a;

3. Divide n by 4 and record the quotient as q;

4. Divide 7a+ 1 by 19 and record the quotient as b;

5. Divide 1 1A+4-B by 29 and record the remainder as m;

6. Divide N+Q+3 1-M by 7 and record the remainder as w;

7. Take the absolute value of 25-m-w, which is the date of Easter. If it is a positive number, the month is April; If it is negative, the month is March; If it is 0, Easter is March 3 1.