| Oracle® OLAP DML Reference 11g Release 2 (11.2) E17122-07 | 
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The DAYOF function returns an INTEGER in the range of 1 through 7, giving the day of the week on which a specified date falls. A result of 1 refers to Sunday. The result has the same dimensions as the specified DATE expression.
INTEGER
DAYOF(date-expression)
An expression that has the DATE data type, or a text expression that specifies a date. Instead of a DATE expression, you can specify a text expression that has values that conform to a valid input style for dates. DAYOF automatically converts the values of the text expression to DATE values, using the current setting of the DATEORDER option to resolve any ambiguity.