Buzz
The WEEKNUM function is a pivotal member of Excel's date and time functions, widely employed for various calculations. This article elucidates its syntax, functionality, and provides practical examples.
Understanding WEEKNUM in Excel
Utilizing the WEEKNUM Function in Excel
1. Description and Usage Syntax
This function returns the week number of a specific date within the year. There are 2 systems used to determine the week number:
- System 1: The week containing January 1st is considered the first week of the year, numbered as 1.
Syntax:
WEEKNUM(Serial_Number,[Return_Type])
Where:
- Serial_Number: Represents the date value for which the week number is to be calculated, it is a required parameter.
- Return_Type: The return value of the function, an optional parameter with the following values:
+ Return_Type = 1 or omitted -> week starts on Sunday and is numbered as 1.
+ Return_Type = 2 -> week starts on Monday and is numbered as 1.
+ Return_Type = 11 -> week starts on Monday and is numbered as 1.
+ Return_Type= 12 -> week starts on Tuesday and is numbered as 1.
+ Return_Type = 13 -> week starts on Wednesday and is numbered as 1.
+ Return_Type = 14 -> week starts on Thursday and is numbered as 1.
+ Return_Type = 15 -> week starts on Friday and is numbered as 1.
+ Return_Type = 16 -> week starts on Saturday and is numbered as 1.
+ Return_Type = 17 -> week starts on Sunday and is numbered as 1.
+ Return_Type = 21 -> week starts on Monday and is numbered as 2.
Note:
- Excel stores dates in a sequential serial number format for ease of calculation.
- If the Serial_Number value falls outside the basic range of date values -> the function returns an error value #VALUE!
2. Specific Scenario Example
Suppose you need to calculate the week number within the year containing the following days:
Step 1: In the cell where you want to calculate, enter the formula: =WEEKNUM(B3,C3)
Step 2: Press Enter -> the date 1/1/2019 will be in week 1 of the year:
Step 3: Similarly, copy the formula for the remaining values -> you will then get the result as shown below:
In case the Serial_Number value is an invalid date -> the function returns an error value #VALUE!
If the Return_Type value falls outside the range of valid values -> the function returns an error value #NUM!
Above, Mytour has just introduced and guided you on how to use the WEEKNUM Function in Excel along with some very specific examples. Essentially, with this function, you only need to remember the syntax: WEEKNUM(Serial_Number,[Return_Type]), where Serial_Number is the date value for which you want to calculate the week number, and Return_Type is the return value of the function.
Wishing you quick memorization of the formula and success in using this formula in Excel.
