Qt Code:
  1. QTimeEdit *timeEdit1;
  2. QTimeEdit *timeEdit2;
  3.  
  4. QTime time1 = timeEdit1->time();
  5. QTime time2 = timeEdit2->time();
  6.  
  7. int hours = time2.secsTo(time1) / 60 / 60;
  8. // -24 < hours < 24
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