Java计算两个日期相差天数详解编程语言

import java.util.*; 
  
public class Test { 
    public static void main(String args[]) { 
        Calendar calendar = Calendar.getInstance(); 
        calendar.setTime(new Date()); 
  
        calendar.set(1991, 7, 7); 
        long time_1 = calendar.getTimeInMillis(); 
  
        calendar.set(2012, 8, 31); 
        long time_2 = calendar.getTimeInMillis(); 
  
        long space = (time_2 - time_1) / (1000 * 60 * 60 * 24); 
        System.out.println("至今我活了大约 " + space + " 天"); 
    } 
}