这是如何做：
long input = 20120720162145L;
DateFormat inputDF = new SimpleDateFormat("yyyyMMddHHmmss");
DateFormat outputDF = new SimpleDateFormat("yyyy-MM-dd K:mm a");
Date date = inputDF.parse(""+input);
System.out.println(outputDF.format(date));
2012-07-20 4:21 PM
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