src/ExpressiveDate.php
protected function modifySeconds($amount, $invert = false)
	{
		$interval = new DateInterval("PT{$amount}S");

		$this->modifyFromInterval($interval, $invert);

		return $this;
	}
protected function modifySeconds($amount, $invert = false)
	{
		$interval = new DateInterval("PT{$amount}S");

		$this->modifyFromInterval($interval, $invert);

		return $this;
	}
protected function modifySeconds ( $ amount , $ invert = false ) { $ interval = new DateInterval ( "PT{$amount}S" ) ; $ this -> modifyFromInterval ( $ interval , $ invert ) ; return $ this ; }
Modify by an amount of seconds.

@param  int  $amount
@param  bool  $invert
@return ExpressiveDate
Modify by an amount of seconds .