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Excel WEEKDAY Function

Excel WEEKDAY function
Summary 

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

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