diff --git a/sql/item_timefunc.cc b/sql/item_timefunc.cc
index a560dbd7876..34b12ee9b55 100644
--- a/sql/item_timefunc.cc
+++ b/sql/item_timefunc.cc
@@ -1091,22 +1091,13 @@ longlong Item_func_yearweek::val_int()
 }
 
 
-static uint weekday_from_item(Item *item, bool *null_value, bool week_starts_on_sunday)
-{
-  MYSQL_TIME ltime;
-  if ((*null_value= Datetime(current_thd, item,
-                             TIME_NO_ZERO_DATE | TIME_NO_ZERO_IN_DATE).
-       copy_to_mysql_time(&ltime, MYSQL_TIMESTAMP_DATETIME)))
-    return 0;
-  return calc_weekday(calc_daynr(ltime.year, ltime.month, ltime.day), week_starts_on_sunday) +
-         MY_TEST(week_starts_on_sunday);
-}
-
-
 longlong Item_func_weekday::val_int()
 {
   DBUG_ASSERT(fixed == 1);
-  return (longlong) weekday_from_item(args[0], &null_value, odbc_type);
+  Datetime dt(current_thd, args[0], TIME_NO_ZERO_DATE | TIME_NO_ZERO_IN_DATE);
+  if ((null_value= !dt.is_valid_datetime()))
+    return 0;
+  return dt.weekday(odbc_type) + MY_TEST(odbc_type);
 }
 
 bool Item_func_dayname::fix_length_and_dec()
@@ -1125,14 +1116,14 @@ bool Item_func_dayname::fix_length_and_dec()
 String* Item_func_dayname::val_str(String* str)
 {
   DBUG_ASSERT(fixed == 1);
-  uint weekday= weekday_from_item(args[0], &null_value, false);
   const char *day_name;
   uint err;
+  Datetime dt(current_thd, args[0], TIME_NO_ZERO_DATE | TIME_NO_ZERO_IN_DATE);
 
-  if (null_value)
+  if ((null_value= !dt.is_valid_datetime()))
     return (String*) 0;
   
-  day_name= locale->day_names->type_names[weekday];
+  day_name= locale->day_names->type_names[dt.weekday(false)];
   str->copy(day_name, (uint) strlen(day_name), &my_charset_utf8_bin,
 	    collation.collation, &err);
   return str;
diff --git a/sql/item_timefunc.h b/sql/item_timefunc.h
index 7450a94673d..6ab644c579b 100644
--- a/sql/item_timefunc.h
+++ b/sql/item_timefunc.h
@@ -426,12 +426,12 @@ public:
 };
 
 
-class Item_func_weekday :public Item_int_func
+class Item_func_weekday :public Item_long_func
 {
   bool odbc_type;
 public:
   Item_func_weekday(THD *thd, Item *a, bool type_arg):
-    Item_int_func(thd, a), odbc_type(type_arg) { }
+    Item_long_func(thd, a), odbc_type(type_arg) { }
   longlong val_int();
   const char *func_name() const
   {
@@ -441,7 +441,6 @@ public:
   {
     return type_handler()->Item_get_date(this, ltime, fuzzydate);
   }
-  const Type_handler *type_handler() const { return &type_handler_long; }
   bool fix_length_and_dec()
   {
     decimals= 0;
diff --git a/sql/sql_type.h b/sql/sql_type.h
index df4b99569c1..75e0bac33c3 100644
--- a/sql/sql_type.h
+++ b/sql/sql_type.h
@@ -292,6 +292,15 @@ class Temporal_with_date: protected MYSQL_TIME
 {
 protected:
   void make_from_item(THD *thd, Item *item, sql_mode_t flags);
+
+  ulong daynr() const
+  {
+    return (ulong) ::calc_daynr((uint) year, (uint) month, (uint) day);
+  }
+  int weekday(bool sunday_first_day_of_week) const
+  {
+    return ::calc_weekday(daynr(), sunday_first_day_of_week);
+  }
   Temporal_with_date(THD *thd, Item *item, sql_mode_t flags)
   {
     make_from_item(thd, item, flags);
@@ -389,6 +398,11 @@ public:
     DBUG_ASSERT(is_valid_datetime_slow());
     return hour == 0 && minute == 0 && second == 0 && second_part == 0;
   }
+  int weekday(bool sunday_first_day_of_week) const
+  {
+    DBUG_ASSERT(is_valid_datetime_slow());
+    return Temporal_with_date::weekday(sunday_first_day_of_week);
+  }
   const MYSQL_TIME *get_mysql_time() const
   {
     DBUG_ASSERT(is_valid_datetime_slow());