java中获取当天零点零分时间

/**
* 获得当天零时零分零秒
* @return
*/
public Date initDateByDay(){
Calendar calendar = Calendar.getInstance();
calendar.setTime(new Date());
calendar.set(Calendar.HOUR, 0);
calendar.set(Calendar.MINUTE, 0);
calendar.set(Calendar.SECOND, 0);
return calendar.getTime();
}