DAYOFYEAR

The DAYOFYEAR function returns an integer between 1 and 366 that represents the day of the year where 1 is January 1.

expression: An expression that returns a value of one of the following built-in data types: a date, a timestamp, a character string, or a graphic string.
If expression is a character or graphic string, its value must be a valid string representation of a date or timestamp. For the valid formats of string representations of dates and timestamps, see String representations of datetime values.

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.

Example

Using the EMPLOYEE table, set the host variable AVG_DAY_OF_YEAR (INTEGER) to the average of the day of the year that employees started on (HIREDATE).
```
  SELECT AVG(DAYOFYEAR(HIREDATE))
    INTO :AVG_DAY_OF_YEAR
    FROM EMPLOYEE
```
Results in AVG_DAY_OF_YEAR being set to 197.