Added simple scroller (NumberPicker) to select year and some text that gives the century value and if it's a leap year

lib/YearsPage.dart

@@ -1,18 +1,40 @@
 import 'package:flutter/material.dart';
 
+import 'package:numberpicker/numberpicker.dart';
+import 'package:ohthatsa/DayCalculator.dart';
+
 import 'AppDrawer.dart';
 
-class YearsPage extends StatelessWidget {
+class YearsPage extends StatefulWidget  {
+  @override
+  _YearsPageState createState() => _YearsPageState();
+}
+
+class _YearsPageState extends State<YearsPage> {
+  int _year = new DateTime.now().year;
   @override
   Widget build(BuildContext context){
     return Scaffold(
-      drawer: AppDrawer(),
-      appBar: AppBar(
-        title: Text("Overview"),
-      ),
-      body: Center(
-          child: Text("Years page")
-      )
+        drawer: AppDrawer(),
+        appBar: AppBar(
+          title: Text("Overview"),
+        ),
+        body: Center(
+            child: new Column(
+              children: <Widget>[
+                new NumberPicker.integer(
+                  initialValue: _year, // TODO set to current year
+                  minValue: 1800,
+                  maxValue: 2399,
+                  onChanged: (newYear) =>
+                    setState(() => _year = newYear),
+                ),
+                new Text("You picked the year: $_year"),
+                new Text("The century code is: " + DayCalculator.getCenturyValue(_year).toString()),
+                new Text("Is this a leap year: " + DayCalculator.isLeapYear(_year).toString()),
+              ]
+            )
+        )
     );
   }
 }

lib/main.dart

@@ -13,7 +13,7 @@ class OhThatsA extends StatelessWidget {
   Widget build(BuildContext context) {
     return MaterialApp(
       title: "OhThatsA",
-      initialRoute: '/monthValues',
+      initialRoute: '/years',
       routes: {
         '/monthValues': (context) => MonthValuesPage(),
         '/years': (context) => YearsPage(),

pubspec.yaml

@@ -23,6 +23,7 @@ environment:
 dependencies:
   flutter:
     sdk: flutter
+  numberpicker: ^1.2.1
 
 
   # The following adds the Cupertino Icons font to your application.