使用Calendar增加日期

/**
* @Description: 当前日期加上n个月返回long date
*/
public static long getLongDateAddMonth(int n){
Calendar cd=Calendar.getInstance();
Date date=new Date();
cd.setTime(date);
cd.add(Calendar.MONTH, n); //将当前日期加n个月
return cd.getTime().getTime();
}

/**
* @Description 当前日期加上n天返回long date*/
public static long getLongDateAddDay(int n){
Calendar cd = Calendar.getInstance();
Date date = new Date();
cd.setTime(date);
cd.add(Calendar.DAY_OF_MONTH, n);
return cd.getTime().getTime();
}