TeamSpeak3/Helper/Convert.php
public static function seconds($seconds, $is_ms = false, $format = "%dD %02d:%02d:%02d")
    {
        if ($is_ms) {
            $seconds = $seconds / 1000;
        }

        return sprintf(
            $format,
            $seconds / 60 / 60 / 24,
            ($seconds / 60 / 60) % 24,
            ($seconds / 60) % 60,
            $seconds % 60
        );
    }
public static function seconds($seconds, $is_ms = false, $format = "%dD %02d:%02d:%02d")
    {
        if ($is_ms) {
            $seconds = $seconds / 1000;
        }

        return sprintf(
            $format,
            $seconds / 60 / 60 / 24,
            ($seconds / 60 / 60) % 24,
            ($seconds / 60) % 60,
            $seconds % 60
        );
    }
Converts seconds/milliseconds to a human readable value.

@param  integer $seconds
@param  boolean $is_ms
@param  string $format
@return string