fix: chinese abbreviated day name in FluentCalendar

src/Core/Components/DateTime/CalendarExtended.cs

@@ -110,22 +110,23 @@ public string GetMonthNameAndYear()
     /// Returns a list of days, abbreviated and complete (Mon, Monday), ...,(Sun, Sunday) in the correct culture.
     /// </summary>
     /// <returns></returns>
-    public IEnumerable<(string Abbreviated, string Name)> GetDayNames()
+    public IEnumerable<(char Abbreviated, string Name)> GetDayNames()
     {
         int firstDayOfWeek = (int)GetFirstDayOfWeek();
         var abbreviated = Culture.DateTimeFormat.AbbreviatedDayNames;
         var names = Culture.DateTimeFormat.DayNames;
-        var dayNames = new (string Abbreviated, string Name)[7];
+        var dayNames = new (char Abbreviated, string Name)[7];
 
         for (int i = 0; i < 7; i++)
         {
             dayNames[i].Name = ToTitleCase(names[i]);
-            dayNames[i].Abbreviated = ToTitleCase(abbreviated[i]);
+            dayNames[i].Abbreviated = ToAbbreviatedDisplay(ToTitleCase(abbreviated[i]));
         }
 
         return Shift(dayNames, firstDayOfWeek);
     }
 
+
     /// <summary>
     /// Returns True if the specified date is in the current month of the <see cref="Date"/>.
     /// </summary>
@@ -177,4 +178,19 @@ private string ToTitleCase(string value)
     {
         return Culture.TextInfo.ToTitleCase(value);
     }
+
+    /// <summary>
+    /// Returns the string according to different cultures
+    /// </summary>
+    /// <param name="value"></param>
+    /// <returns></returns>
+    private char ToAbbreviatedDisplay(string value)
+    {
+        switch (Culture.Name)
+        {
+            case string x when x.StartsWith("zh-"):
+                return value[1];
+            default: return value[0];
+        }
+    }
 }

src/Core/Components/DateTime/FluentCalendar.razor

@@ -43,7 +43,7 @@
             @foreach (var weekDay in CalendarExtended.GetDayNames())
             {
                 <div class="week-day" part="week-day" title="@weekDay.Name" abbr="@weekDay.Name">
-                    @weekDay.Abbreviated[0]
+                    @weekDay.Abbreviated
                 </div>
             }
         </div>