SimpleDateFormat F = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
System.out.println("å½åæ¶é´ï¼"+F.format(new Date()));
Calendar calendar = Calendar.getInstance();
calendar.add(Calendar.HOUR, -2);
System.out.println("两å°æ¶ä»¥åæ¶é´ï¼"+F.format(calendar.getTime()));
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