Use consistent date instead of DateTime.now() in evaluation tests (#103269)

packages/flutter_tools/test/integration.shard/expression_evaluation_test.dart

@@ -157,19 +157,16 @@ Future<void> evaluateTrivialExpressions(FlutterTestDriver flutter) async {
 }
 
 Future<void> evaluateComplexExpressions(FlutterTestDriver flutter) async {
-  final ObjRef res = await flutter.evaluateInFrame('new DateTime.now().year');
-  expectValueOfType(res, InstanceKind.kInt, DateTime.now().year.toString());
+  final ObjRef res = await flutter.evaluateInFrame('new DateTime(2000).year');
+  expectValueOfType(res, InstanceKind.kInt, '2000');
 }
 
 Future<void> evaluateComplexReturningExpressions(FlutterTestDriver flutter) async {
-  final DateTime now = DateTime.now();
-  final ObjRef resp = await flutter.evaluateInFrame('new DateTime.now()');
+  final DateTime date = DateTime(2000);
+  final ObjRef resp = await flutter.evaluateInFrame('new DateTime(2000)');
   expectInstanceOfClass(resp, 'DateTime');
-  // Ensure we got a reasonable approximation. The more accurate we try to
-  // make this, the more likely it'll fail due to differences in the time
-  // in the remote VM and the local VM at the time the code runs.
   final ObjRef res = await flutter.evaluate(resp.id, r'"$year-$month-$day"');
-  expectValue(res, '${now.year}-${now.month}-${now.day}');
+  expectValue(res, '${date.year}-${date.month}-${date.day}');
 }
 
 void expectInstanceOfClass(ObjRef result, String name) {