//当前时间 Calendar cal = Calendar.getInstance(); //以前的时间 Calendar calBefore = Calendar.getInstance(); calBefore.set(2010, 3, 25, 5, 6, 10); //天数差 long day = (cal.getTimeInMillis() - calBefore.getTimeInMillis())/(1000*3600*24);
Calendar now = Calendar.getInstance(); Calendar someday = Calendar.getInstance(); someday.set(2010,5,1,5,6,10);long days = TimeUnit.MILLISECONDS.toDays(now.getTimeInMillis()-someday.getTimeInMillis());
楼上正解public class Test9 { private static final int YEAR = 1949; private static final int MONTH = 10; private static final int DAY = 1; public static void main(String[] args) { System.out.println("请输入日期(格式为yyyy-M-d):"); Scanner sc = new Scanner(System.in); String str = sc.next(); String[] s = str.split("-"); //获得键盘输入的年,月,日 int year = Integer.valueOf(s[0]); int month = Integer.valueOf(s[1]); int day = Integer.valueOf(s[2]); //设置两个日期 Calendar c1 = Calendar.getInstance(); c1.set(year, month - 1, day);// 设置日历 Calendar c2 = Calendar.getInstance(); c2.set(YEAR, MONTH - 1, DAY); //日期:1949-10-1 //转化为相对时间 long t1 = c1.getTimeInMillis(); long t2 = c2.getTimeInMillis(); //计算相差天数 long days = (t1 - t2) / (60*60*24*1000); System.out.println(days); }}
Calendar cal = Calendar.getInstance();
//以前的时间
Calendar calBefore = Calendar.getInstance();
calBefore.set(2010, 3, 25, 5, 6, 10);
//天数差
long day = (cal.getTimeInMillis() - calBefore.getTimeInMillis())/(1000*3600*24);
Calendar someday = Calendar.getInstance();
someday.set(2010,5,1,5,6,10);long days = TimeUnit.MILLISECONDS.toDays(now.getTimeInMillis()-someday.getTimeInMillis());
private static final int YEAR = 1949;
private static final int MONTH = 10;
private static final int DAY = 1;
public static void main(String[] args) {
System.out.println("请输入日期(格式为yyyy-M-d):");
Scanner sc = new Scanner(System.in);
String str = sc.next();
String[] s = str.split("-");
//获得键盘输入的年,月,日
int year = Integer.valueOf(s[0]);
int month = Integer.valueOf(s[1]);
int day = Integer.valueOf(s[2]);
//设置两个日期
Calendar c1 = Calendar.getInstance();
c1.set(year, month - 1, day);// 设置日历
Calendar c2 = Calendar.getInstance();
c2.set(YEAR, MONTH - 1, DAY); //日期:1949-10-1
//转化为相对时间
long t1 = c1.getTimeInMillis();
long t2 = c2.getTimeInMillis();
//计算相差天数
long days = (t1 - t2) / (60*60*24*1000);
System.out.println(days);
}}