# WEEKDAY function

This article describes the formula syntax and usage of the WEEKDAY function (function: A prewritten formula that takes a value or values, performs an operation, and returns a value or values. Use functions to simplify and shorten formulas on a worksheet, especially those that perform lengthy or complex calculations.) 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 (argument: A value that provides information to an action, an event, a method, a property, a function, or a procedure.):

• 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

The example may be easier to understand if you copy it to a blank worksheet.

1. Select the example in this article. If you are copying the example in Excel Online, copy and paste one cell at a time.
Important: Do not select the row or column headers.

Selecting an example from Help

1. Press CTRL+C.
2. Create a blank workbook or worksheet.
3. In the worksheet, select cell A1, and press CTRL+V. If you are working in Excel Online, repeat copying and pasting for each cell in the example.
Important: For the example to work properly, you must paste it into cell A1 of the worksheet.
4. To switch between viewing the results and viewing the formulas that return the results, press CTRL+` (grave accent), or on the Formulas tab, in the Formula Auditing group, click the Show Formulas button.

After you copy the example to a blank worksheet, you can adapt it to suit your needs.

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

Notes

• 2/14/2008 is a Thursday.
• In Excel Online, to view the result in its proper format, select the cell, and then on the Home tab, in the Number group, click the arrow next to Number Format, and click General.

Applies to:
Excel 2010, Excel Web App, SharePoint Online for enterprises, SharePoint Online for professionals and small businesses