TimeDifference

/**
     *  test getNumberOfWindowFirstPage
     */
    public void testGetNumberOfWindowFirstPage() {
        Calendar cal = Calendar.getInstance();
        System.out.println("Seconds: 15");
        cal.add(Calendar.SECOND, 15);
        System.out.println(printDifference(cal.getTime()));
        System.out.println("min 1, 15sec");
        cal.add(Calendar.MINUTE, 1);
        System.out.println(printDifference(cal.getTime()));
        System.out.println("Minutes: 59:15");
        cal.add(Calendar.MINUTE, 58);
        System.out.println(printDifference(cal.getTime()));
        cal = Calendar.getInstance();
        System.out.println("Minutes: 158");
        cal.add(Calendar.MINUTE, 158);
        System.out.println(printDifference(cal.getTime()));
        cal = Calendar.getInstance();
        System.out.println("Minutes: 1480");
        cal.add(Calendar.MINUTE, 1480);
        System.out.println(printDifference(cal.getTime()));
        cal = Calendar.getInstance();
        System.out.println("Minutes: 1830");
        cal.add(Calendar.MINUTE, 1830);
        System.out.println(printDifference(cal.getTime()));
        cal = Calendar.getInstance();
        System.out.println("Minutes: 4450");
        cal.add(Calendar.MINUTE, 4450);
        System.out.println(printDifference(cal.getTime()));
        cal = Calendar.getInstance();
        System.out.println("Minutes: -100");
        cal.add(Calendar.MINUTE, -100);
        System.out.println(printDifference(cal.getTime()));
        cal = Calendar.getInstance();
        System.out.println("2days::22hrs::33mins::15sec");
//        cal.add(Calendar.DATE, 2);
//        cal.add(Calendar.HOUR, 22);
        cal.add(Calendar.MINUTE, 33);
        cal.add(Calendar.SECOND, 15);
        System.out.println(printDifference(cal.getTime()));
    }
    private String printDifference(Date upComing) {
        final int milli = 1000;
        final int sec = milli;
        final int min = 60 * milli;
        final int hour = 60 * min;
        final int day = 24 * hour;
        Date now = new Date();
        String output = "";
        //difference
        long difference = upComing.getTime() - now.getTime();
        if (difference < 1) {
            return "0sec";
        }
        //days
        long days = difference / day;
        System.out.println("days:" + days);
//        if (days > 1) {
//            output = output + " " + days + "days";
//        } else if (days == 1) {
//            output = output + " " + days + "day";
//        }
        if (days > 1) {
            output = output + " " + days + "d";
        }
        //hours
        long hours = (difference % day) / hour;
        System.out.println("hours:" + hours);
//        if (hours > 1) {
//            output = output + " " + hours + "hrs";
//        } else if (hours == 1) {
//            output = output + " " + hours + "hr";
//        }
        if (hours > 1) {
            output = output + " " + hours + "h";
        }
        //only do minutes and seconds if not days
        if (days == 0) {
            long mins = (difference % hour) / min;
            System.out.println("mins:" + mins);
//            if (mins > 1) {
//                output = output + " " + mins + "mins";
//            } else if (mins == 1) {
//                output = output + " " + mins + "min";
//            }
            output = output + " " + mins + "m";
            if (hours == 0) {
                //only do secconds if no hours
                long secs = (difference % min) / sec;
                System.out.println("secs:" + secs);
//                if (secs > 1) {
//                    output = output + " " + secs + "secs";
//                } else if (secs == 1) {
//                    output = output + " " + secs + "sec";
//                }
              output = output + " " + secs + "s";
            }
        }
        return output;
    }