java 获取两个日期的天数间隔

最新推荐文章于 2024-06-29 03:11:20 发布

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本文介绍了一个实用的Java工具类，用于计算两个日期之间的天数间隔。利用Java 8的LocalDate和ChronoUnit，该工具类能够高效准确地计算出日期差。

java 获取两个日期的天数间隔

主要使用 java8 的

import java.time.LocalDate;
import java.time.temporal.ChronoUnit;

package com.example.books.utils;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.time.LocalDate;
import java.time.temporal.ChronoUnit;
import java.util.Date;

public class DateTimeUtil {

    /**
     * 时间戳转日期时间
     * @param s
     * @return
     */
    public static Date stampToDate(String s){
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        long lt = new Long(s);
        return new Date(lt);
    }

    /**
     * 计算现在到某一个日期的间隔天数
     * @param endDate
     * @return
     */
    public static long currentToEnd(Date endDate){
        String[] currentStr = new SimpleDateFormat("yyyy-MM-dd").format(new Date()).split("-");
        String[] endStr = new SimpleDateFormat("yyyy-MM-dd").format(endDate).split("-");
        Integer currentYear = Integer.parseInt(currentStr[0]);
        Integer currentMonth = Integer.parseInt(currentStr[1]);
        Integer currentDay = Integer.parseInt(currentStr[2]);
        Integer endYear = Integer.parseInt(endStr[0]);
        Integer endMonth = Integer.parseInt(endStr[1]);
        Integer endDay = Integer.parseInt(endStr[2]);
        LocalDate endLocalDate = LocalDate.of(endYear,endMonth,endDay);
        return LocalDate.now().until(endLocalDate,ChronoUnit.DAYS);
    }

    /**
     * 计算两个日期之间的间隔天数
     * @param startDate
     * @param endDate
     * @return
     */
    public static long startToEnd(Date startDate, Date endDate){
        String[] startStr = new SimpleDateFormat("yyyy-MM-dd").format(startDate).split("-");
        String[] endStr = new SimpleDateFormat("yyyy-MM-dd").format(endDate).split("-");
        Integer startYear = Integer.parseInt(startStr[0]);
        Integer startMonth = Integer.parseInt(startStr[1]);
        Integer startDay = Integer.parseInt(startStr[2]);
        Integer endYear = Integer.parseInt(endStr[0]);
        Integer endMonth = Integer.parseInt(endStr[1]);
        Integer endDay = Integer.parseInt(endStr[2]);
        LocalDate endLocalDate = LocalDate.of(endYear,endMonth,endDay);
        LocalDate startLocalDate = LocalDate.of(startYear,startMonth,startDay);
        return startLocalDate.until(endLocalDate,ChronoUnit.DAYS);
    }

    public static void main(String[] args) {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        Date startDate = null;
        try {
            startDate = sdf.parse("2018-09-01 15:42:55");
        } catch (ParseException e) {
            e.printStackTrace();
        }
        System.out.println("currentToEnd:"+DateTimeUtil.currentToEnd(startDate));
    }

}