Time Until New Year

/* Write a PHP script TimeUntilNewYear.php. Use the built-in function getdate() to get the current date and time.
Print how many hours, minutes and seconds are left until New Year and how many days, hours, minutes and seconds
are left in a counter format . The examples show the current date and time in "d-m-Y G:i:s" format.
Use the current time. */

<?php
date_default_timezone_set('Europe/Sofia');
function getTimeIntervalUntilNewYear($inputDateStr = null) {
    $currentTime = getdate();
    $currentYear = $currentTime['year'];
    $currentTime = $currentTime[0];

    if ($inputDateStr !== null) {
        $inputDate = preg_split("/\D+/", $inputDateStr);
        if (count($inputDate) == 6) {
            $currentTime = mktime($inputDate[3], $inputDate[4], $inputDate[5],
                $inputDate[1], $inputDate[0], $inputDate[2]);
            $currentYear = $inputDate[2];
        }
    }

    $newYearTime = mktime(23, 59, 59, 12, 31, $currentYear);
    $totalSeconds = $newYearTime - $currentTime;
    $totalMinutes = (int)($totalSeconds / 60);
    $totalHours = (int)($totalSeconds / 3600);
    $days = (int)($totalSeconds / 86400);
    $seconds = $totalSeconds % 86400;
    $hours = (int)($seconds / 3600);
    $seconds = $seconds % 3600;
    $minutes = (int)($seconds / 60);
    $seconds = $seconds % 60;

    echo "<p>Hours until new year : $totalHours</p>\n<p>Minutes until new year : " .
        number_format($totalMinutes, 0, ' ', ' ') . "</p>\n" .
        "<p>Seconds until new year : " . number_format($totalSeconds, 0, ' ', ' ') . "</p>\n" .
        "<p>Days:Hours:Minutes:Seconds $days:$hours:$minutes:$seconds</p>\n";
}

getTimeIntervalUntilNewYear('12-08-2014 11:08:47');
getTimeIntervalUntilNewYear('12-08-2014 13:07:09');
getTimeIntervalUntilNewYear('12-02-2015 20:30:10');
getTimeIntervalUntilNewYear();
?>