WEEK

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The WEEK function returns an integer between 1 and 54 that represents the week of the year. The week starts with Sunday, and January 1 is always in the first week.

expression
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. 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