Weekday function

This article describes the formula syntax and usage of the WEEKDAY  function in Microsoft Excel.

Description

Returns the day of the week corresponding to a date. The day is given as an integer, ranging from 1 (Sunday) to 7 (Saturday), by default.

Syntax

WEEKDAY(serial_number,[return_type])

The WEEKDAY function syntax has the following arguments:

• Serial_number    Required. A sequential number that represents the date of the day you are trying to find. Dates should be entered by using the DATE function, or as results of other formulas or functions. For example, use DATE(2008,5,23) for the 23rd day of May, 2008. Problems can occur if dates are entered as text.

• Return_type    Optional. A number that determines the type of return value.

Return_type	Number returned
1 or omitted	Numbers 1 (Sunday) through 7 (Saturday). Behaves like previous versions of Microsoft Excel.
2	Numbers 1 (Monday) through 7 (Sunday).
3	Numbers 0 (Monday) through 6 (Sunday).
11	Numbers 1 (Monday) through 7 (Sunday).
12	Numbers 1 (Tuesday) through 7 (Monday).
13	Numbers 1 (Wednesday) through 7 (Tuesday).
14	Numbers 1 (Thursday) through 7 (Wednesday).
15	Numbers 1 (Friday) through 7 (Thursday).
16	Numbers 1 (Saturday) through 7 (Friday).
17	Numbers 1 (Sunday) through 7 (Saturday).

Remark

• Microsoft Excel stores dates as sequential serial numbers so they can be used in calculations. By default, January 1, 1900 is serial number 1, and January 1, 2008 is serial number 39448 because it is 39,448 days after January 1, 1900.

• If serial_number is out of range for the current date base value, a #NUM! error is returned.

• If return_type is out of the range specified in the table above, a #NUM! error is returned.

Example

Copy the example data in the following table, and paste it in cell A1 of a new Excel worksheet. For formulas to show results, select them, press F2, and then press Enter. If you need to, you can adjust the column widths to see all the data.

Data
2/14/2008
Formula	Description (Result)	Result
=WEEKDAY(A2)	Day of the week, with numbers 1 (Sunday) through 7 (Saturday) (5)	5
=WEEKDAY(A2, 2)	Day of the week, with numbers 1 (Monday) through 7 (Sunday) (4)	4
=WEEKDAY(A2, 3)	Day of the week, with numbers 0 (Monday) through 6 (Sunday) (3)	3