va獲取當月第一天的零點零分和最後一天的23點59分
阿新 • • 發佈：2018-12-12
public static void main(){ SimpleDateFormat sdf = new SimpleDateFormat(“yyyy-MM-dd hh:mm:ss”); 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(Calendar.SECOND,0); //將毫秒至0 calendar.set(Calendar.MILLISECOND, 0); //獲得當前月第一天 Date startDate = calendar.getTime(); //將當前月加1； calendar.add(Calendar.MONTH, 1); //在當前月的下一月基礎上減去1毫秒 calendar.add(Calendar.MILLISECOND, -1); //獲得當前月最後一天 Date endDate = calendar.getTime();
System.out.println("The first day of month=="+startDate .toString()); System.out.println("first day:"+startDate .getTime()); System.out.println("The last day of month=="+endDate .toString()); System.out.println("last day:"+endDate .getTime()); System.out.println("The first day of month=="+sdf.format(startDate );); System.out.println("The last day of month=="+sdf.format(endDate ););
}