Hutool使用教程：计算日期时间差

String dateStr1 = "2017-03-01 22:33:23"; Date date1 = DateUtil.parse(dateStr1); String dateStr2 = "2017-04-01 23:33:23"; Date date2 = DateUtil.parse(dateStr2); //相差一个月，31天 long betweenDay = DateUtil.between(date1, date2, DateUnit.DAY);