Java返回昨天凌晨时间和今天凌晨时间的工具类

Posted 2022-08-16 364.99°

import java.sql.Timestamp;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.Map;

/**
 * @Author: chenJY
 * @Description: 获取前一天凌晨和今天凌晨的时间戳，返回字符串形式
 * @Date: 2022-08-12 9:24
 */
public class DateUtil 
    /**
     * @Description 获取前一天凌晨时间戳
     * @author chenJY
     * @date 2022/8/12 9:25
     * @return String
    */
    public static String getStartTimestamp() 
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(new Date());
        calendar.set(Calendar.HOUR_OF_DAY, 0);
        calendar.set(Calendar.MINUTE, 0);
        calendar.set(Calendar.SECOND, 0);
        calendar.add(Calendar.DAY_OF_MONTH, -1);
        Date start = calendar.getTime();
        Timestamp timestamp = new Timestamp(start.getTime());
        return timestamp.toString().substring(0,19);
    

    /**
     * @Description 获取今日凌晨时间戳
     * @author chenJY
     * @date 2022/8/12 9:27
     * @return String
    */
    public static String getEndTimestamp() 
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(new Date());
        calendar.set(Calendar.HOUR_OF_DAY, 0);
        calendar.set(Calendar.MINUTE, 0);
        calendar.set(Calendar.SECOND, 0);
        Date start = calendar.getTime();
        /*获取时间戳，并返回字符串格式时间
        Timestamp timestamp = new Timestamp(start.getTime());
        return timestamp.toString().substring(0,19);
        */

        // SimpleDateFormat.format格式化时间，并返回字符串格式
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        return dateFormat.format(start).toString();
    

/*测试main方法
    public static void main(String[] args) 
        String yesterday = DateUtil.getStartTimestamp();
        String today = DateUtil.getEndTimestamp();
    */