Time function optimization

Src/Asp.Net/SqlSugar/ExpressionsToSql/ResolveItems/MethodCallExpressionResolve.cs

@@ -882,6 +882,10 @@ namespace SqlSugar
             {
                 return $"to_char({value},'{formatString}') ";
             }
+            else if (IsMySql()&& formatString == "yyyy-MM-dd") 
+            {
+                return $"DATE_FORMAT({value}, '%Y-%m-%d')";
+            }
             else if (formatString == "yyyy-MM-dd" && IsSqlServer())
             {
                 return $"CONVERT(varchar(100),convert(datetime,{value}), 23)";