Get different time properties for a certain amount of seconds and help to format these properties like the PHP "date" function.

getTime.php

<?php
class TotalTime
{
    public function __construct($seconds)
    {
        $this->total_seconds = (int) $seconds;
        $this->_getTime();
    }

    /**
     * Return a formatted time.
     *
     * Inspired by the "date" function (https://github.com/php/php-src/blob/master/ext/date/php_date.c).
     *
     * @param string $format
     *   The format of the outputted time string. See the formatting options below.
     *     -- years
     *     y: The number of years.
     *     -- days
     *     e: The total number of days.
     *     d: The number of days.
     *     -- time, hours
     *     u: The total number of hours.
     *     h: The number of hours.
     *     H: The number of hours with leading zero.
     *     -- time, minutes
     *     j: The total number of minutes.
     *     m: The number of minutes.
     *     M: The number of minutes with leading zero.
     *     -- time, seconds
     *     s: The number of seconds.
     *     S: The number of seconds with leading zero.
     * @param int $seconds
     *   The number of seconds to convert.
     *
     * @return string
     *   The formatted time string.
     */
    public function format($format)
    {
        $ret = '';

        $format_len = strlen($format);
        for ($k=0;$k<$format_len;$k++) {
            switch ($format[$k]) {
                /* years */
                case 'y':$ret .= sprintf("%d",     (int) $this->years); break;
                /* days */
                case 'e':$ret .= sprintf("%d",     (int) $this->total_days); break;
                case 'd':$ret .= sprintf("%d",     (int) $this->days); break;
                /* time */
                case 'u':$ret .= sprintf("%d",     (int) $this->total_hours); break;
                case 'h':$ret .= sprintf("%d",     (int) $this->hours); break;
                case 'H':$ret .= sprintf("%02d",   (int) $this->hours); break;
                case 'j':$ret .= sprintf("%d",     (int) $this->total_minutes); break;
                case 'm':$ret .= sprintf("%d",     (int) $this->minutes); break;
                case 'M':$ret .= sprintf("%02d",   (int) $this->minutes); break;
                case 's':$ret .= sprintf("%d",     (int) $this->seconds); break;
                case 'S':$ret .= sprintf("%02d",   (int) $this->seconds); break;
                default: $ret .= $format[$k]; break;
            }
        }

        return $ret;
    }

    private function _getTime()
    {
        $aMinute = 60;
        $anHour  = 60*$aMinute;
        $aDay    = 24*$anHour;
        $aYear   = 365.25*$aDay;
        $mathFn  = ($this->total_seconds<0?'ceil':'floor');

        $this->years            = $mathFn($this->total_seconds / $aYear);
        $this->days             = $mathFn(($this->total_seconds % $aYear) / $aDay);
        $this->hours            = $mathFn((($this->total_seconds % $aYear) % $aDay) / $anHour);
        $this->minutes          = $mathFn(((($this->total_seconds % $aYear) % $aDay) % $anHour) / $aMinute);
        $this->seconds          = $mathFn(((($this->total_seconds % $aYear) % $aDay) % $anHour) % $aMinute);
        $this->total_days       = $mathFn($this->total_seconds / $aDay);
        $this->total_hours      = $mathFn($this->total_seconds / $anHour);
        $this->total_minutes    = $mathFn($this->total_seconds / $aMinute);
    }
}