Java日期加减

 
DateTime newDate = new Date();    
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");                        
//获取当前时间
String day = (newDate);
Calendar calendar = ();                                
(newDate); 
(Calendar.DAY_OF_MONTH, -1); //当前时间减去一天，即一天前的时间 
String beforeday = (());
 
//(, 1);//增加一年
    
//(, 1);//增加一天  
   
//(, -10);//减10天  
   
//(, 1);//增加一个月   

 Calendar cal = ();
    // 赋值时年月日时分秒常用的6个值，注意月份下标从0开始，所以取月份要+1
    ("年:" + ());
    ("月:" + (() + 1));       
    ("日:" + (Calendar.DAY_OF_MONTH));
    ("时:" + (Calendar.HOUR_OF_DAY));
    ("分:" + ());
    ("秒:" + ());