Use the TimeOfDay property of a date value to determine whether its a date-only or date-time property

Author: MaggieKimani1

src/Microsoft.OpenApi.Readers/ParseNodes/OpenApiAnyConverter.cs

@@ -63,10 +63,12 @@ public static IOpenApiAny GetSpecificOpenApiAny(IOpenApiAny openApiAny, OpenApiS
             {
                 // More narrow type detection for explicit strings, only check types that are passed as strings
                 if (schema == null)
-                {
+                 {
                     if (DateTimeOffset.TryParse(value, CultureInfo.InvariantCulture, DateTimeStyles.None, out var dateTimeValue))
                     {
-                        return new OpenApiDateTime(dateTimeValue);
+                        // if the time component is exactly midnight(00:00:00) meaning no time has elapsed, return a date-only value
+                        return dateTimeValue.TimeOfDay == TimeSpan.Zero ? new OpenApiDate(dateTimeValue.Date) 
+                            : new OpenApiDateTime(dateTimeValue);
                     }
                 }
                 else if (type == "string")