MONTH

The schema is SYSIBM.

The argument must be an expression that returns one of the following built-in data types: a date, a timestamp, a character string, a graphic string, or a numeric data type.

• 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 of 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 number, it must be a date or timestamp duration. For the valid formats of date and timestamp durations, see Datetime operands.

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.

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

• If the argument is a date, timestamp, or string representation of either, the result is the month part of the value, which is an integer between 1 and 12.
• If the argument is a date duration or timestamp duration, the result is the month part of the value, which is an integer between -99 and 99. A nonzero result has the same sign as the argument.
• If the argument contains a time zone, the result is the year part of the value expressed in UTC.

   SELECT * FROM DSN8A10.EMP
     WHERE MONTH(BIRTHDATE) = 5;

Example 2: The following invocations of the MONTH function returns the same result:

SELECT MONTH('2003-01-02-20.10.05.123456'), 
			MONTH('2003-01-02-12.10.05.123456-08:00'), 
			MONTH('2003-01-03-05.10.05.123456+09:00') 
		FROM SYSIBM.SYSDUMMY1;

For each invocation of the MONTH function in this SELECT statement, the result is 1.

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: 2003-01-02-20.10.05.123456. The month portion of the UTC representation is 1.