java计算两个日期之间相差几天(小时、天)小时计算

Java中计算两个日期相减-CSDN博客

package com.test;import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
import java.time.temporal.ChronoUnit;
import java.util.Date;public class Test004 {public static void main(String[] args) throws ParseException {// 定义日期格式DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");// 输入两个日期String date1String = "2023-10-01 10:12:11";String date2String = "2023-10-15 12:25:25";// 将字符串转换为 LocalDate 对象LocalDate date1 = LocalDate.parse(date1String, formatter);LocalDate date2 = LocalDate.parse(date2String, formatter);// 计算日期之间的天数差long daysBetween = ChronoUnit.DAYS.between(date1, date2);// 输出结果System.out.println("两个日期之间相差 " + daysBetween + " 天。");}
}

2.小时计算需要用糊涂工具类

  SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");Date parse = format.parse("2024-10-21 16:23:24");long between = DateUtil.between(new Date(), parse, DateUnit.HOUR);