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