src/Data/BizField.php
public function getValueOnCreate()
    {
        if ($this->valueOnCreate !== null) {
            return $this->getSqlValue(Expression::evaluateExpression($this->valueOnCreate, $this->getDataObj()));
        }
        return "";
    }
public function getValueOnCreate()
    {
        if ($this->valueOnCreate !== null) {
            return $this->getSqlValue(Expression::evaluateExpression($this->valueOnCreate, $this->getDataObj()));
        }
        return "";
    }
Get the value when a new record is created

@return mixed the value of the field