同一天的时间差，显示为HHMMSS和指定日期时间部分

//1.hhmmss

private String setGoodsDisBalance(Date startTime,Date endTime){
//时间差：毫秒ms
long diff = endTime.getTime() - startTime.getTime();
//秒
long diffSeconds = diff / 1000 % 60;
//分钟
long diffMinutes = diff / (60 * 1000) % 60;
//时
long diffHours = diff / (60 * 60 * 1000) % 24;
//格式化时间差并返回：HH24MISS (结束显示000000)
return String.format("%02d", diffHours)
+String.format("%02d", diffMinutes)
+String.format("%02d", diffSeconds);

}

2.指定日期时间部分（如:当日10:00:00~24:00:00）

String currDate = (new SimpleDateFormat("yyyy-MM-dd")).format(new Date());
String startTime=currDate+" 10:00:00";
String endTime=currDate+" 24:00:00";