用Calendar类来做Calendar c1=Calendar.getInstance();
c1.set(2004,4,12,19,19,19);
long l1=c1.getTimeInMillis();Calendar c2=Calendar.getInstance();
c2.set(2004,4,12,19,20,20);
long l2=c2.getTimeInMillis();int seconds=(int)((l2-l1)/1000);//得到相差秒数
c1.set(2004,4,12,19,19,19);
long l1=c1.getTimeInMillis();Calendar c2=Calendar.getInstance();
c2.set(2004,4,12,19,20,20);
long l2=c2.getTimeInMillis();int seconds=(int)((l2-l1)/1000);//得到相差秒数
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