两个日期相关的方法

1、计算两个日期之间的分钟数：

Calendar calendar = Calendar.getInstance();calendar.setTime(new Date());System.out.println(calendar.getTimeInMillis());SimpleDateFormat d = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");Date ds = d.parse("2013-12-12 12:12:12");Date d2 = d.parse("2013-12-12 12:15:12");System.out.println((d2.getTime()-ds.getTime())/60/1000);

?2、比较两个日期

String s1 = "2013-01-12 12:01:01";Date date = new Date();SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");Calendar c1 = Calendar.getInstance();Calendar c2 = Calendar.getInstance();try {c1.setTime(sdf.parse(s1));c2.setTime(date);System.out.println(c1.compareTo(c2));                         //输出-1，说明给点时间早于当前时间，若是1则表示大于当前时间} catch (ParseException e) {e.printStackTrace();}

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