Calculating difference between 2 dates

Again to do Date arithematic we need Calender class.

Following function takes 2 dates and prints difference in days, millis etc...you can make you own function to return long etc...

public static void printDiff(Date dat1, Date dat2)
    {
        // Creates two calendars instances
        Calendar cal1 = Calendar.getInstance();
        Calendar cal2 = Calendar.getInstance();
        
        // Set the date for both of the calendar instance 
       cal1.setTime(dat1);
       cal2.setTime(dat2);

        // Get the represented date in milliseconds
        long milis1 = cal1.getTimeInMillis();
        long milis2 = cal2.getTimeInMillis();
        
        // Calculate difference in milliseconds
        long diff = milis2 - milis1;
        
        // Calculate difference in seconds
        long diffSeconds = diff / 1000;
        
        // Calculate difference in minutes
        long diffMinutes = diff / (60 * 1000);
        
        // Calculate difference in hours
        long diffHours = diff / (60 * 60 * 1000);
        
        // Calculate difference in days
        long diffDays = diff / (24 * 60 * 60 * 1000);
        
        System.out.println("In milliseconds: " + diff + " milliseconds.");
        System.out.println("In seconds: " + diffSeconds + " seconds.");
        System.out.println("In minutes: " + diffMinutes + " minutes.");
        System.out.println("In hours: " + diffHours + " hours.");
        System.out.println("In days: " + diffDays + " days.");
    }