java獲取當月第一天的零點零分和最後一天的23點59分

Calendar calendar = Calendar.getInstance(); calendar.set(Calendar.DAY_OF_MONTH, 1); //將小時至0 calendar.set(Calendar.HOUR_OF_DAY, 0); //將分鐘至0 calendar.set(Calendar.MINUTE, 0); //將秒至0 calendar.set(Calenda

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