How to get the string length in QML?

[mirro]

TypeError: property 'length' of object is not a function

QUrl source(“qrc:/qmlTest.qml”);
QQuickWidget*  quickWidget = new QQuickWidget;
quickWidget->setResizeMode(QQuickWidget::SizeRootObjectToView );
quickWidget->setSource(source);
 
 
import QtQuick 2.8
import QtQuick.Controls 2.1
  
Rectangle {
     id: mapWindow
     property string  date: ""
     Text{
             x:0
             y:0
             font.family:"微软雅黑"
             font.pointSize:7
             text:date.substring(0,date.length())
             color:"#0AAAB1"
     }
 }

[jsulm]

@mirro Since length is a property shouldn't you remove ()?

date.length