Excel WEEKDAY Function

 Introduction

The Excel WEEKDAY function takes a date and returns a number between 1-7 representing the day of week. By default WEEKDAY returns 1 for Sunday and 7 for Saturday. You can use the WEEKDAY function inside other formulas to check the day of week and react as needed.

Purpose

Get the day of the week as a number

Return value

A number between 0 and 7

Syntax

=WEEKDAY (serial_number, [return_type])

Arguments

·    serial_number - The date for which you want to get the day of week.

·   return_type - [optional] A number representing day of week mapping scheme. Default is 1.

Usage notes

WEEKDAY accepts a date and returns a number between 1-7 representing the day of week for that date. By default WEEKDAY returns 1 for Sunday and 7 for Saturday as shown in the table below:

Result

Meaning

1

Sunday

2

Monday

3

Tuesday

4

Wednesday

5

Thursday

6

Friday

7

Saturday

WEEKDAY supports several numbering schemes. The return type argument determines which scheme used to map each day of week to a number. The return type is optional and defaults to 1. The table below shows the result and mapping associated with each return type:

Return type

Numeric result

Day mapping

none

1-7

Sunday-Saturday

1

1-7

Sunday-Saturday

2

1-7

Monday-Sunday

3

0-6

Monday-Sunday

11

1-7

Monday-Sunday

12

1-7

Tuesday-Monday

13

1-7

Wednesday-Tuesday

14

1-7

Thursday-Wednesday

15

1-7

Friday-Thursday

16

1-7

Saturday-Friday

17

1-7

Sunday-Saturday

The WEEKDAY function will return a value even when the date is empty. Take care to trap this result if blank dates are possible.


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