DAY

The DAY function returns the day part of a value.

The argument must be a date, timestamp, or a valid character string representation of a date or timestamp that is not a CLOB, LONG VARCHAR, or XML value. The result of the function is a large integer. If the argument can be null, the result can be null; if the argument is null, the result is the null value.

The other rules depend on the data type of the argument specified:

If the argument is a date, timestamp, or valid string representation of a date or timestamp: The result is the day part of the value, which is an integer between 1 and 31.
If the argument is a time duration or timestamp duration: The result is the day part of the value, which is an integer between -99 and 99. A nonzero result has the same sign as the argument.

Syntax

DAY ( expression )

values day('2006-08-02');

The resulting value is 2.