Java 獲取 當天開始時間和結束時間

Java 獲取當天的開始時間 00:00:00

 public long getFirstTime (){
        Calendar calendar1 = Calendar.getInstance();
        calendar1.setTime(new Date());
        calendar1.set(Calendar.HOUR_OF_DAY, 0);
        calendar1.set(Calendar.MINUTE, 0);
        calendar1.set(Calendar.SECOND, 0);
        calendar1.set(Calendar.MILLISECOND, 0);
        return  calendar1.getTime().getTime();
    } 

Java 獲取當天的結束時間 23:59:59

public long getEndTime(){
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(new 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().getTime();
    }

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