WEEKDAY function

Category: Date and time
Introduced: Excel 2003

Summary

Converts a serial number to a day of the week

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).

Example

=WEEKDAY(A2)
=WEEKDAY(A2, 2)
=WEEKDAY(A2, 3)

Microsoft Support Page

https://support.microsoft.com/en-us/office/weekday-function-60e44483-2ed1-439f-8bd0-e404c190949a

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