DAYOFWEEK

The schema is SYSIBM.

The argument must be 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, it must not be a CLOB or DBCLOB, and its value must be a valid string representation of a date or timestamp with an actual length that is not greater than 255 bytes. For the valid formats of string representations of dates and timestamps, see String representations of datetime values.

If expression is a timestamp with a time zone, or a valid string representation of a timestamp with a time zone, the result is determined from the UTC representation of the datetime value.

The result of the function is a large integer.

The result can be null; if the argument is null, the result is the null value.

   SELECT DAYOFWEEK(HIREDATE)
     INTO :DAY_OF_WEEK
     FROM DSN8A10.EMP
     WHERE EMPNO = '000010';

   SELECT DAYOFWEEK(CAST('10/11/1998' AS DATE)),
          DAYOFWEEK(TIMESTAMP('10/12/1998', '01.02')),
          DAYOFWEEK(CAST(CAST('10/11/1998' AS DATE) AS CHAR(20))),
          DAYOFWEEK(CAST(TIMESTAMP('10/12/1998', '01.02') AS CHAR(26)))
     FROM SYSIBM.SYSDUMMY1;

Example 3: The following invocations of the DAYOFWEEK function returns the same result:

SELECT DAYOFWEEK('2003-01-02-20.00.00'), 
			DAYOFWEEK('2003-01-02-12.00.00-08:00'), 
			DAYOFWEEK('2003-01-03-05.00.00+09:00') 
		FROM SYSIBM.SYSDUMMY1;

For each invocation of the DAYOFWEEK function in this SELECT statement, the result is 5 (Sunday is considered the first day of the week).

When the input argument contains a time zone, the result is determined from the UTC representation of the input value. The string representations of a timestamp with a time zone in the SELECT statement all have the same UTC representation: 2003-01-02-20.00.00.