terah / fluent-assert

        {

            return $this;

        }

        if ( strtotime($this->value) === false )

        {

            $message = $message ?: $this->overrideError;

            $message = sprintf(

                $message ?: 'Value "%s" is not a date.',

                $this->stringify($this->value)

            );

            throw $this->createException($message, $this->overrideCode ?: self::INVALID_DATE, $fieldName);

        }

        return $this;

    }

        {

            return $this;

        }

        if ( null === json_decode($this->value) && JSON_ERROR_NONE !== json_last_error() )

        {

            $message = $message ?: $this->overrideError;

            $message = sprintf(

                $message ?: 'Value "%s" is not a valid JSON string.',

                $this->stringify($this->value)

            );

            throw $this->createException($message, $this->overrideCode ?: self::INVALID_JSON_STRING, $fieldName);

        }

        return $this;

    }