From 84ddffb36b0fe5b8aa47d39b20448fb3258b3db8 Mon Sep 17 00:00:00 2001
From: David LJ <mail@davidlj95.com>
Date: Thu, 7 Jan 2021 19:34:03 +0100
Subject: [PATCH] fix(cupertinoDatePicker): do not display previous day when
 minimumDate is midnight (#72933)

---
 .../lib/src/cupertino/date_picker.dart        |  2 +-
 .../test/cupertino/date_picker_test.dart      | 23 +++++++++++++++++++
 2 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/packages/flutter/lib/src/cupertino/date_picker.dart b/packages/flutter/lib/src/cupertino/date_picker.dart
index 314e2a4e60c..47c458f972c 100644
--- a/packages/flutter/lib/src/cupertino/date_picker.dart
+++ b/packages/flutter/lib/src/cupertino/date_picker.dart
@@ -705,7 +705,7 @@ class _CupertinoDatePickerDateTimeState extends State<CupertinoDatePicker> {
 
           final DateTime now = DateTime.now();
 
-          if (widget.minimumDate?.isAfter(rangeEnd) == true)
+          if (widget.minimumDate?.isBefore(rangeEnd) == false)
             return null;
           if (widget.maximumDate?.isAfter(rangeStart) == false)
             return null;
diff --git a/packages/flutter/test/cupertino/date_picker_test.dart b/packages/flutter/test/cupertino/date_picker_test.dart
index 5eafa3cd86d..5c61cb2b0f1 100644
--- a/packages/flutter/test/cupertino/date_picker_test.dart
+++ b/packages/flutter/test/cupertino/date_picker_test.dart
@@ -933,6 +933,29 @@ void main() {
         expect(date.day, minDate.day);
     });
 
+    testWidgets('date picker does not display previous day of minimumDate if it is set at midnight', (WidgetTester tester) async {
+      // Regression test for https://github.com/flutter/flutter/issues/72932
+      final DateTime minDate = DateTime(2019, 12, 31);
+      await tester.pumpWidget(
+        CupertinoApp(
+          home: Center(
+            child: SizedBox(
+              height: 400.0,
+              width: 400.0,
+              child: CupertinoDatePicker(
+                mode: CupertinoDatePickerMode.dateAndTime,
+                minimumDate: minDate,
+                onDateTimeChanged: (DateTime newDate) { },
+                initialDateTime: minDate.add(const Duration(days: 1)),
+              ),
+            ),
+          ),
+        ),
+      );
+
+      expect(find.text('Mon Dec 30'), findsNothing);
+    });
+
 
     group('Picker handles initial noon/midnight times', () {
       testWidgets('midnight', (WidgetTester tester) async {