diff --git a/src/MaaWpfGui/Helper/Utils.cs b/src/MaaWpfGui/Helper/Utils.cs
new file mode 100644
index 0000000000..b95ba5a92d
--- /dev/null
+++ b/src/MaaWpfGui/Helper/Utils.cs
@@ -0,0 +1,66 @@
+// <copyright file="Utils.cs" company="MaaAssistantArknights">
+// MaaWpfGui - A part of the MaaCoreArknights project
+// Copyright (C) 2021 MistEO and Contributors
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY
+// </copyright>
+
+using System;
+
+namespace MaaWpfGui
+{
+    public static class Utils
+    {
+        /// <summary>
+        /// 获取yj历时间
+        /// </summary>
+        /// <returns>yj历时间</returns>
+        public static DateTime GetYJTimeNow()
+        {
+            return DateTime.UtcNow.AddHours(4);
+        }
+
+        /// <summary>
+        /// 获取yj历时间字符串
+        /// </summary>
+        /// <returns>yj历时间的字符串表示形式</returns>
+        public static string GetYJTimeNowString()
+        {
+            return GetYJTimeNow().ToString();
+        }
+
+        /// <summary>
+        /// 获取yj历日期
+        /// </summary>
+        /// <returns>yj历日期</returns>
+        public static DateTime GetYJTimeDate()
+        {
+            return GetYJTimeNow().Date;
+        }
+
+        /// <summary>
+        /// 获取yj历日期字符串
+        /// </summary>
+        /// <returns>yj历日期的字符串表示形式</returns>
+        public static string GetYJTimeDateString()
+        {
+            return GetYJTimeDate().ToString();
+        }
+
+        /// <summary>
+        /// 将日期转换为yj历日期
+        /// </summary>
+        /// <param name="dt"></param>
+        /// <returns>yj历格式的时间</returns>
+        public static DateTime ToYJTime(DateTime dt)
+        {
+            return dt.AddHours(4);
+        }
+    }
+}
diff --git a/src/MaaWpfGui/MaaWpfGui.csproj b/src/MaaWpfGui/MaaWpfGui.csproj
index face25fa5e..1508a6ac98 100644
--- a/src/MaaWpfGui/MaaWpfGui.csproj
+++ b/src/MaaWpfGui/MaaWpfGui.csproj
@@ -103,6 +103,7 @@
       <Generator>MSBuild:Compile</Generator>
       <SubType>Designer</SubType>
     </ApplicationDefinition>
+    <Compile Include="Helper\Utils.cs" />
     <Compile Include="Main\Bootstrapper.cs" />
     <Compile Include="GlobalSuppressions.cs" />
     <Compile Include="Main\AsstProxy.cs" />
diff --git a/src/MaaWpfGui/Main/AsstProxy.cs b/src/MaaWpfGui/Main/AsstProxy.cs
index aae571ac4d..95ffedab1b 100644
--- a/src/MaaWpfGui/Main/AsstProxy.cs
+++ b/src/MaaWpfGui/Main/AsstProxy.cs
@@ -500,7 +500,7 @@ namespace MaaWpfGui
                     }
                     else if (taskChain == "Mall")
                     {
-                        settingsModel.LastCreditFightTaskTime = DateTime.UtcNow.AddHours(4).Date.ToString();
+                        settingsModel.LastCreditFightTaskTime = Utils.GetYJTimeDateString();
                     }
 
                     mainModel.AddLog(Localization.GetString("CompleteTask") + taskChain);
diff --git a/src/MaaWpfGui/Main/SettingsViewModel.cs b/src/MaaWpfGui/Main/SettingsViewModel.cs
index 31528878bc..6fefe2ac5b 100644
--- a/src/MaaWpfGui/Main/SettingsViewModel.cs
+++ b/src/MaaWpfGui/Main/SettingsViewModel.cs
@@ -1032,7 +1032,7 @@ namespace MaaWpfGui
         }
 
         /* 访问好友设置 */
-        private string _lastCreditFightTaskTime = ViewStatusStorage.Get("Visit.LastCreditFightTaskTime", DateTime.UtcNow.AddHours(4).Date.AddDays(-1).ToString());
+        private string _lastCreditFightTaskTime = ViewStatusStorage.Get("Visit.LastCreditFightTaskTime", Utils.GetYJTimeDate().AddDays(-1).ToString());
 
         public string LastCreditFightTaskTime
         {
@@ -1053,7 +1053,7 @@ namespace MaaWpfGui
         {
             get
             {
-                if (DateTime.UtcNow.AddHours(4).Date > DateTime.Parse(LastCreditFightTaskTime).Date)
+                if (Utils.GetYJTimeDate() > DateTime.Parse(LastCreditFightTaskTime).Date)
                 {
                     return _creditFightTaskEnabled;
                 }
diff --git a/src/MaaWpfGui/Main/TaskQueueViewModel.cs b/src/MaaWpfGui/Main/TaskQueueViewModel.cs
index a3ff975969..09dc36416d 100644
--- a/src/MaaWpfGui/Main/TaskQueueViewModel.cs
+++ b/src/MaaWpfGui/Main/TaskQueueViewModel.cs
@@ -309,26 +309,26 @@ namespace MaaWpfGui
 
         private bool NeedToUpdateDatePrompt()
         {
-            var now = DateTime.UtcNow.AddHours(8);
+            var now = Utils.GetYJTimeNow();
             var hour = now.Hour;
             var min = now.Minute;
-            if (hour >= 0 && hour < 4)
-            {
-                now = now.AddDays(-1);
-            }
 
-            if (min == 0 && hour == 16)
+            // yj历的16点
+            if (min == 0 && hour == 12)
             {
                 return true;
             }
-            else if (_curDayOfWeek == now.DayOfWeek)
-            {
-                return false;
-            }
             else
             {
-                _curDayOfWeek = now.DayOfWeek;
-                return true;
+                if (_curDayOfWeek == now.DayOfWeek)
+                {
+                    return false;
+                }
+                else
+                {
+                    _curDayOfWeek = now.DayOfWeek;
+                    return true;
+                }
             }
         }