Java Data Type - 如何获取日期开始时间

import java.util.Calendar;
import java.util.Date;

public class Main {

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


  public static Date getTheBeginingOfDate(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();
  }
}