Add time zone setting, modify default zone +8.

lib/basic/Common.dart

@@ -1,6 +1,8 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_styled_toast/flutter_styled_toast.dart';
 
+import 'config/TimeOffsetHour.dart';
+
 double coverWidth = 210;
 double coverHeight = 315;
 
@@ -208,7 +210,7 @@ String add0(int num, int len) {
 /// 格式化时间 2012-34-56
 String formatTimeToDate(String str) {
   try {
-    var c = DateTime.parse(str);
+    var c = DateTime.parse(str).add(Duration(hours: currentTimeOffsetHour()));
     return "${add0(c.year, 4)}-${add0(c.month, 2)}-${add0(c.day, 2)}";
   } catch (e) {
     return "-";
@@ -218,7 +220,7 @@ String formatTimeToDate(String str) {
 /// 格式化时间 2012-34-56 12:34:56
 String formatTimeToDateTime(String str) {
   try {
-    var c = DateTime.parse(str);
+    var c = DateTime.parse(str).add(Duration(hours: currentTimeOffsetHour()));
     return "${add0(c.year, 4)}-${add0(c.month, 2)}-${add0(c.day, 2)} ${add0(c.hour, 2)}:${add0(c.minute, 2)}";
   } catch (e) {
     return "-";

lib/basic/config/KeyboardController.dart

@@ -7,13 +7,13 @@ import 'package:flutter/material.dart';
 import '../Common.dart';
 import '../Method.dart';
 
-const propertyName = "keyboardController";
+const _propertyName = "keyboardController";
 
 late bool keyboardController;
 
 Future<void> initKeyboardController() async {
   keyboardController =
-      (await method.loadProperty(propertyName, "false")) == "true";
+      (await method.loadProperty(_propertyName, "false")) == "true";
 }
 
 String keyboardControllerName() {
@@ -25,7 +25,7 @@ Future<void> chooseKeyboardController(BuildContext context) async {
       await chooseListDialog<String>(context, "键盘控制翻页", ["是", "否"]);
   if (result != null) {
     var target = result == "是";
-    await method.saveProperty(propertyName, "$target");
+    await method.saveProperty(_propertyName, "$target");
     keyboardController = target;
   }
 }

lib/basic/config/TimeOffsetHour.dart

@@ -0,0 +1,54 @@
+import 'package:flutter/material.dart';
+
+import '../Common.dart';
+import '../Method.dart';
+
+int _timeOffsetHour = 8;
+
+int currentTimeOffsetHour() {
+  return _timeOffsetHour;
+}
+
+const _propertyName = "timeOffsetHour";
+
+Future<void> initTimeZone() async {
+  _timeOffsetHour = int.parse(await method.loadProperty(_propertyName, "8"));
+}
+
+Future<void> chooseTimeZone(BuildContext context) async {
+  List<String> timeZones = [];
+  for (var i = -12; i <= 12; i++) {
+    var str = i.toString();
+    if (!str.startsWith("-")) {
+      str = "+" + str;
+    }
+    timeZones.add(str);
+  }
+  String? result = await chooseListDialog<String>(context, "时区选择", timeZones);
+  if (result != null) {
+    if (result.startsWith("+")) {
+      result = result.substring(1);
+    }
+    _timeOffsetHour = int.parse(result);
+    await method.saveProperty(_propertyName, "$result");
+  }
+}
+
+Widget timeZoneSetting() {
+  return StatefulBuilder(
+    builder: (BuildContext context, void Function(void Function()) setState) {
+      var c = "$_timeOffsetHour";
+      if (!c.startsWith("-")) {
+        c = "+" + c;
+      }
+      return ListTile(
+        title: Text("时区"),
+        subtitle: Text(c),
+        onTap: () async {
+          await chooseTimeZone(context);
+          setState(() {});
+        },
+      );
+    },
+  );
+}

lib/screens/InitScreen.dart

@@ -18,6 +18,7 @@ import 'package:pikapi/basic/config/ShadowCategories.dart';
 import 'package:pikapi/basic/config/Themes.dart';
 import 'package:pikapi/basic/Method.dart';
 import 'package:pikapi/basic/config/ListLayout.dart';
+import 'package:pikapi/basic/config/TimeOffsetHour.dart';
 import 'package:pikapi/basic/config/VolumeController.dart';
 
 import 'AccountScreen.dart';
@@ -59,6 +60,7 @@ class _InitScreenState extends State<InitScreen> {
     await initKeyboardController();
     await initAndroidDisplayMode();
     await initChooserRoot();
+    await initTimeZone();
     // 登录, 如果token失效重新登录, 网络不好的时候可能需要1分钟
     if (await method.preLogin()) {
       // 如果token或username+password有效则直接进入登录好的界面

lib/screens/SettingsScreen.dart

@@ -17,6 +17,7 @@ import 'package:pikapi/basic/config/ReaderType.dart';
 import 'package:pikapi/basic/config/Quality.dart';
 import 'package:pikapi/basic/config/ShadowCategories.dart';
 import 'package:pikapi/basic/config/Themes.dart';
+import 'package:pikapi/basic/config/TimeOffsetHour.dart';
 import 'package:pikapi/basic/config/VolumeController.dart';
 import 'package:pikapi/screens/components/NetworkSetting.dart';
 
@@ -112,6 +113,7 @@ class _SettingsScreenState extends State<SettingsScreen> {
                 setState(() {});
               },
             ),
+            timeZoneSetting(),
             Divider(),
             ListTile(
               title: Text("自动清理缓存"),