Java日期: 比较日期大小,日期时间差,增加减少天数

比较日期大小

date1.compareTo(date2)

日期时间差

private static long daysBetween(Date one, Date two) {  
    long difference =  (one.getTime()-two.getTime())/86400000;  
    return Math.abs(difference);  
} 

• https://www.cnblogs.com/firstdream/p/8961014.html

增加减少天数

/**
 * 获取某天的时间
 * @param index 为正表示当前时间加天数，为负表示当前时间减天数
 * @return String
 */
public static String getTimeDay( int index){
    TimeZone tz = TimeZone.getTimeZone("Asia/Shanghai");
    TimeZone.setDefault(tz);
    Calendar calendar = Calendar.getInstance();
    SimpleDateFormat fmt = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    calendar.add(Calendar.DAY_OF_MONTH,index);
    String date = fmt.format(calendar.getTime());
    return date;
}

• https://www.cnblogs.com/unknows/p/9881154.html