Java日期工具类

package org.jeecg.modules.inHospital.tempCheckFile;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

/**
 * @Description
 * @Author zhang_s
 * @Create 2024/6/25 15:04
 */
public class DtUtil {
    /**
     * 获取当前时间的时间戳
     */
    public static int getCurrentTimeIntValue() {
        return (int) (System.currentTimeMillis() / 1000);
    }


    /**
     * 获取days天后的当前时间 时间戳
     */
    public static int addDaysTimeStamp(int days) {
        Calendar cal = Calendar.getInstance();
        cal.setTime(new Date());
        cal.add(Calendar.DATE, days);
        return (int) (cal.getTimeInMillis() / 1000);
    }

    /**
     * 获取今日零点的时间戳
     */
    public static int getStartTimeStamp() {
        Calendar todayStart = Calendar.getInstance();
        todayStart.set(Calendar.HOUR_OF_DAY, 0);
        todayStart.set(Calendar.MINUTE, 0);
        todayStart.set(Calendar.SECOND, 0);
        todayStart.set(Calendar.MILLISECOND, 0);
        long time = todayStart.getTimeInMillis() / 1000;
        return (int) time;
    }

    /**
     * 获取今日23：59：59的时间戳
     */
    public static int getEndTimeStamp() {
        Calendar todayEnd = Calendar.getInstance();
        todayEnd.set(Calendar.HOUR_OF_DAY, 23);
        todayEnd.set(Calendar.MINUTE, 59);
        todayEnd.set(Calendar.SECOND, 59);
        todayEnd.set(Calendar.MILLISECOND, 999);
        long time = todayEnd.getTimeInMillis() / 1000;
        return (int) time;
    }

    /**
     * 获取指定时间零点的时间戳
     */
    public static String getStartTimeStamp(Date date) {
        SimpleDateFormat sdfYMD = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        Calendar todayStart = Calendar.getInstance();
        todayStart.setTime(date);
        todayStart.set(Calendar.HOUR_OF_DAY, 0);
        todayStart.set(Calendar.MINUTE, 0);
        todayStart.set(Calendar.SECOND, 0);
        todayStart.set(Calendar.MILLISECOND, 0);

        String yesterday = sdfYMD.format(todayStart.getTime());
        return yesterday;
    }

    /**
     * 获取指定时间23：59：59的时间戳
     */
    public static String getEndTimeStamp(Date date) {
        SimpleDateFormat sdfYMD = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        Calendar todayEnd = Calendar.getInstance();
        todayEnd.setTime(date);
        todayEnd.set(Calendar.HOUR_OF_DAY, 23);
        todayEnd.set(Calendar.MINUTE, 59);
        todayEnd.set(Calendar.SECOND, 59);
        todayEnd.set(Calendar.MILLISECOND, 999);
        String yesterday = sdfYMD.format(todayEnd.getTime());
        return yesterday;
    }

    /**
     * 获取昨天零点的时间（字符串）
     */
    public static String getYesterDayStartTimeStamp() {
        SimpleDateFormat sdfYMD = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.SECOND, 0); //这是将【秒】设置为0
        calendar.set(Calendar.MINUTE, 0); //这是将【分】设置为0
        calendar.set(Calendar.HOUR_OF_DAY, 0); //这是将【时】设置为0
        calendar.add(Calendar.DATE, -1); //当前日期加一
        String yesterday = sdfYMD.format(calendar.getTime()); //获取昨天的时间 如2021-02-25 00:00:00
        return yesterday;
    }

    /**
     * 获取昨天零点的时间戳
     */
    public static Integer getBeforeStartTime() {
        Calendar todayStart = Calendar.getInstance();
        todayStart.set(Calendar.HOUR_OF_DAY, 0);
        todayStart.set(Calendar.MINUTE, 0);
        todayStart.set(Calendar.SECOND, 0);
        todayStart.set(Calendar.MILLISECOND, 0);
        long time = todayStart.getTimeInMillis() / 1000;
        return (int) time - 86400;
    }

    /**
     * 获取昨天23:59:59的时间（字符串）
     */
    public static String getYesterDayEndTimeStamp() {
        SimpleDateFormat sdfYMD = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.SECOND, 59); //这是将当天的【秒】设置为0
        calendar.set(Calendar.MINUTE, 59); //这是将当天的【分】设置为0
        calendar.set(Calendar.HOUR_OF_DAY, 23); //这是将当天的【时】设置为0
        calendar.add(Calendar.DATE, -1); //当前日期加一
        String yesterday = sdfYMD.format(calendar.getTime()); //获取第二天的时间 2021-02-25 00:00:00
        return yesterday;
    }


    /**
     * 获取明天零点的时间戳
     */
    public static Integer getAfterStartime() {
        Calendar todayStart = Calendar.getInstance();
        todayStart.set(Calendar.HOUR_OF_DAY, 0);
        todayStart.set(Calendar.MINUTE, 0);
        todayStart.set(Calendar.SECOND, 0);
        todayStart.set(Calendar.MILLISECOND, 0);
        long time = todayStart.getTimeInMillis() / 1000;
        return (int) time + 86400;
    }

    /**
     * 将昨天凌晨时间转换为Date类型（下面设置成这样 new simpleDateFormat("yyyy-MM-dd HH:mm:ss") 数据中对应的字段类型就是DateTime）　　　* 这个方法中调用了上面的getYesterDayStartTimeStamp()方法哦
     */
    public static Date getDateTime() {
        Date dateTime = null;
        String yesterDayStartTimeStamp = DtUtil.getYesterDayStartTimeStamp();
        SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        try {
            dateTime = formatter.parse(yesterDayStartTimeStamp);
        } catch (ParseException e) {
            e.printStackTrace();
        }
        //Sun May 09 00:00:00 CST 2021
        return dateTime;
    }

    public static void main(String[] args) {
        System.out.println(DtUtil.getStartTimeStamp(new Date()));
        System.out.println(DtUtil.getEndTimeStamp(new Date()));
    }
}