Improve error handling in DateOnly and TimeOnly converters

Co-authored-by: ScarletKuro <19953225+ScarletKuro@users.noreply.github.com>

Author: Copilot

src/Scarlet.System.Text.Json.DateTimeConverter/Converters/DateOnlyConverter.cs

@@ -35,8 +35,15 @@ public override DateOnly Read(ref Utf8JsonReader reader, Type typeToConvert, Jso
         }
 
         // Fallback to reading as DateTime and converting to DateOnly
-        var dateTime = reader.GetDateTime();
-        return DateOnly.FromDateTime(dateTime);
+        try
+        {
+            var dateTime = reader.GetDateTime();
+            return DateOnly.FromDateTime(dateTime);
+        }
+        catch (Exception ex) when (ex is FormatException || ex is InvalidOperationException)
+        {
+            throw new JsonException($"Unable to convert token to DateOnly using format '{_format}'.", ex);
+        }
     }
 
     /// <summary>

src/Scarlet.System.Text.Json.DateTimeConverter/Converters/TimeOnlyConverter.cs

@@ -35,8 +35,15 @@ public override TimeOnly Read(ref Utf8JsonReader reader, Type typeToConvert, Jso
         }
 
         // Fallback to reading as DateTime and converting to TimeOnly
-        var dateTime = reader.GetDateTime();
-        return TimeOnly.FromDateTime(dateTime);
+        try
+        {
+            var dateTime = reader.GetDateTime();
+            return TimeOnly.FromDateTime(dateTime);
+        }
+        catch (Exception ex) when (ex is FormatException || ex is InvalidOperationException)
+        {
+            throw new JsonException($"Unable to convert token to TimeOnly using format '{_format}'.", ex);
+        }
     }
 
     /// <summary>