long time = dateA.getTime() dateB.getTime();
// 一分未満の端数を求めて、分に変換
long sec = ((time  % ( 1000 * 60 * 60 * 60)) / 1000)  % 60;
// 一時間未満の端数を求めて、分に変換
long min = ((time  % ( 1000 * 60 * 60)) / 1000 / 60) % 60;
// 何時間かを求める
long hour = ( time / ( 1000 * 60 * 60));
String strTime = hour + "h" + min + "m" /* +sec + "s" */;
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