java获取当天开始与结束时间date类型

以下是获取当天开始和结束时间的Java代码：

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

public class DateUtil {

    public static void main(String[] args) {
        Date today = new Date();
        Date startDate = getStartDate(today);
        Date endDate = getEndDate(today);
        DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        System.out.println("今天开始时间：" + df.format(startDate));
        System.out.println("今天结束时间：" + df.format(endDate));
    }

    /**
     * 获取当天开始时间
     *
     * @param date 当前日期
     * @return 当天开始时间
     */
    public static Date getStartDate(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        calendar.set(Calendar.HOUR_OF_DAY, 0);
        calendar.set(Calendar.MINUTE, 0);
        calendar.set(Calendar.SECOND, 0);
        calendar.set(Calendar.MILLISECOND, 0);
        return calendar.getTime();
    }

    /**
     * 获取当天结束时间
     *
     * @param date 当前日期
     * @return 当天结束时间
     */
    public static Date getEndDate(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        calendar.set(Calendar.HOUR_OF_DAY, 23);
        calendar.set(Calendar.MINUTE, 59);
        calendar.set(Calendar.SECOND, 59);
        calendar.set(Calendar.MILLISECOND, 999);
        return calendar.getTime();
    }
}