CBPCalc :: FunctionAddWorkDays: Bitrix method

      
<?php 
//  CBPCalc :: FunctionAddWorkDays()
//  /dist/bitrix/modules/bizproc/classes/general/calc.php:683

    private function FunctionAddWorkDays($args)
    {
        if (!is_array($args))
            $args = [$args];

        $ar = $this->ArrgsToArray($args);
        $date = array_shift($ar);
        $offset = $this->getDateTimeOffset($date);
        $days = (int) array_shift($ar);

        if (($date = $this->makeTimestamp($date)) === false)
            return null;

        if ($days === 0 || !CModule::IncludeModule('calendar'))
            return $date;

        $date = $this->addWorkDay($date, $days);

        return new Bizproc\BaseType\Value\DateTime($date, $offset);
    }