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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