Date日期比对

 　　　　 Calendar calendar1 = Calendar.getInstance();
         Calendar calendar2 = Calendar.getInstance();
         calendar1.set(2007, 01, 10);
         calendar2.set(2008, 07, 01);
         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 秒: " + diffSeconds + " seconds.");
         System.out.println("Time in 分钟: " + diffMinutes + " minutes.");
         System.out.println("Time in 小时: " + diffHours + " hours.");
         System.out.println("Time in 天: " + diffDays + " days.");