import java.util.Scanner; public class Main { public static void main(String[] args) { Scanner in = new Scanner(System.in); // 平年每月的天数 int[] commonYear = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; // 闰年每月的天数 int[] leapYear = {31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; String startDate =...