11. Days diff

• Code that calculates the number of days between two dates

  
      Date startDate = gregStartDate.getTime();
      Date endDate = gregEndDate.getTime();
      long startDateMS = startDate.getTime();
      long endDateMS = endDate.getTime();
      long elapsedMS = endDateMS – startDateMS;
      long elapsedDays = elapsedMS / (24 * 60 * 60 * 1000);