两个日期间的相隔天数

   public static void main(String[] args){
     Calendar calendar1 = Calendar.getInstance();
     Calendar calendar2 = Calendar.getInstance();
     calendar1.set(2015, 01, 26);
     calendar2.set(2015, 10, 23);
     long milliseconds1 = calendar1.getTimeInMillis();
     long milliseconds2 = calendar2.getTimeInMillis();
     long diff = milliseconds2 - milliseconds1;
     long diffSeconds = diff / 1000;
     long diffMinutes = diff / (60 * 1000);
     long diffHours = diff / (60 * 60 * 1000);
     long diffDays = diff / (24 * 60 * 60 * 1000);
     System.out.println("\nThe Date Different Example");
     System.out.println("Time in milliseconds: " + diff + " milliseconds.");
     System.out.println("Time in seconds: " + diffSeconds + " seconds.");
     System.out.println("Time in minutes: " + diffMinutes + " minutes.");
     System.out.println("Time in hours: " + diffHours + " hours.");
     System.out.println("Time in days: " + diffDays + " days.");
   }