// 獲取當天凌晨0點0分0秒Date Calendar calendar1 = Calendar.getInstance(); calendar1.set(calendar1.get(Calendar.YEAR), calendar1.get(Calendar.MONTH), calendar1.get(Calendar.DAY_OF_MONTH), 0, 0, 0); Date beginOfDate = calendar1.getTime(); System.out.println(beginOfDate);
也可以設置為任一時間
Calendar.HOUR_OF_DAY是24小時制
Calendar.HOUR是12小時制