java获取当月第一天的零点零分和最后一天的23点59分

Calendar calendar = Calendar.getInstance(); calendar.set(Calendar.DAY_OF_MONTH, 1); //将小时至0 calendar.set(Calendar.HOUR_OF_DAY, 0); //将分钟至0 calendar.set(Calendar.MINUTE, 0); //将秒至0 calendar.set(Calenda

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