public function addSpan(DateTimeSpan $dtsSpan)
    {
        // And add the Span Second count to it
        $this->Timestamp = $this->Timestamp + $dtsSpan->Seconds;
        return $this;
    }
public function addSpan(DateTimeSpan $dtsSpan)
    {
        // And add the Span Second count to it
        $this->Timestamp = $this->Timestamp + $dtsSpan->Seconds;
        return $this;
    }
public function addSpan ( DateTimeSpan $ dtsSpan ) { // And add the Span Second count to it $ this -> Timestamp = $ this -> Timestamp + $ dtsSpan -> Seconds ; return $ this ; }
Add a datespan to the current date. Use add for adding a date interval.

@param \DateInterval|DateTimeSpan $dtsSpan
@return $this
Add a datespan to the current date . Use add for adding a date interval .