<date_function> ::=
  ADDDATE ( <date_or_timestamp_expression>, <expression> )
| SUBDATE ( <date_or_timestamp_expression>, <expression> )
| DATEDIFF ( <date_or_timestamp_expression>, <date_or_timestamp_expression> )
| DAYOFWEEK ( <date_or_timestamp_expression> )
| WEEKOFYEAR ( <date_or_timestamp_expression> )
| DAYOFMONTH ( <date_or_timestamp_expression> )
| DAYOFYEAR ( <date_or_timestamp_expression> )
| MAKEDATE ( <expression>, <expression> )
| DAYNAME ( <date_or_timestamp_expression> )
| MONTHNAME ( <date_or_timestamp_expression> )