using UK time instead of german time for requests

lib/main.dart

@@ -4,6 +4,7 @@ import 'package:provider/provider.dart';
 import 'pages/flood_station_page.dart';
 import 'pages/landing_page.dart';
 import 'services/flood_station_provider.dart';
+import 'package:timezone/data/latest.dart' as tz;
 
 void main() {
   runApp(
@@ -19,6 +20,7 @@ class MyApp extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
+    tz.initializeTimeZones();
     return MaterialApp(
       title: 'Floodwatch',
       theme: ThemeData(

lib/services/api.dart

@@ -1,5 +1,6 @@
 import 'package:http/http.dart' as http;
 import 'dart:convert';
+import 'package:timezone/timezone.dart' as tz;
 
 import '../model/flood_station.dart';
 import '../model/reading.dart';
@@ -40,9 +41,9 @@ class Api {
   static Future<List<Reading>> fetchReadingsFromStation(
       String stationId) async {
     List<Reading> readings = [];
-    final dateTime = DateTime.now().subtract(Duration(days: 1));
+    final dateTime = _getCurrentUKTime().subtract(Duration(days: 1)).toUtc();
     final url =
-        '$_rootUrl/id/stations/$stationId/readings?since=${dateTime.toIso8601String()}Z&_sorted';
+        '$_rootUrl/id/stations/$stationId/readings?since=${dateTime.toIso8601String()}&_sorted';
     final response = await http.get(Uri.parse(url));
     if (response.statusCode == 200) {
       final Map<String, dynamic> jsonStr = jsonDecode(response.body);
@@ -52,4 +53,9 @@ class Api {
     }
     return readings.reversed.toList();
   }
+
+  static DateTime _getCurrentUKTime() {
+    final london = tz.getLocation('Europe/London');
+    return tz.TZDateTime.now(london);
+  }
 }

pubspec.yaml

@@ -15,6 +15,7 @@ dependencies:
   http: ^1.3.0
   intl: ^0.20.2
   provider: ^6.1.2
+  timezone: ^0.10.0
 
 dev_dependencies:
   flutter_test: