# WEEKDAY Formula

## Definition

The WEEKDAY formula in Excel is a handy tool that returns the day of the week corresponding to a date, with the result as an integer ranging from 1 (Sunday) to 7 (Saturday).

## Purpose

WEEKDAY assists in extracting the day of the week from a given date. This is incredibly useful in scenarios where you need to perform data analysis based on the days of the week.

## Syntax

The syntax for creating formulas in Excel, particularly WEEKDAY, is:

```=WEEKDAY(serial_number, [return_type]) ```

## Parameters

The WEEKDAY formula uses two parameters:

• `serial_number`: This mandatory parameter represents the date for which you want to find the day of the week.
• `return_type`: An optional parameter which dictates the day numbering system to use. If omitted, Excel defaults to 1 (Sunday) to 7 (Saturday).

## Returns

The WEEKDAY formula returns an integer between 1 and 7 representing the day of the week.

## Usage notes

WEEKDAY only considers the date component if you input a datetime value. For optimal use, ensure your data is in a format Excel can interpret as a date or datetime.

## Availability

The WEEKDAY formula is available across all versions of Excel, making it a common addition to most spreadsheet calculators.

## Example #1

Let’s assume cell A1 contains the date “2023-06-23”. To find out the day of the week, you can use:

```=WEEKDAY(A1) ```

Since June 23, 2023, is a Friday, the formula will return 6.

## Example #2

If you have the date “2023-06-24” in cell A1 and want the week to start on Monday (1), use the return_type parameter:

```=WEEKDAY(A1, 2) ```

This will return 6, as June 24, 2023, is a Saturday.

## Example #3

For dates with time values like “2023-06-23 18:00:00” in cell A1, WEEKDAY disregards the time component:

```=WEEKDAY(A1) ```

The formula will return 6, corresponding to Friday.

## Example #4

WEEKDAY can also handle dates in text format. With “2023-06-23” in cell A1:

```=WEEKDAY(A1) ```

The result will again be 6, as June 23, 2023, is a Friday.

## Example #5

For invalid dates like “Hello” in cell A1:

```=WEEKDAY(A1) ```

Excel will return a #VALUE! error, indicating that the input is not a valid date.

## Tips and Tricks

Remember that WEEKDAY only extracts the day from a date. It does not return the actual date.

## Limitations

WEEKDAY can’t process text that isn’t a valid date and will return a #VALUE! error.

## Common errors and solutions

The #VALUE! error occurs if the serial_number parameter is not a valid date. Make sure your date inputs are valid.

## Best Practices

Cross-check the date data to ensure it is valid. Also, use the return_type parameter to control the starting day of the week according to your requirements.

## List of Related Functions

Related Excel functions include:

• DATE: Returns the serial number of a particular date.
• DAY: Extracts the day of the month from a date.
• TODAY: Returns the current date.

## Frequently Used with the Formulas

WEEKDAY is frequently used with DATE and TODAY formulas for advanced date-based data analysis.

### Q. Can the WEEKDAY formula work with time?

The WEEKDAY formula only considers the date part of a datetime input. The time part is disregarded.

### Q. What if I input a text string into the WEEKDAY formula?

The formula will return a #VALUE! error if the text string can’t be interpreted as a valid date.

### Q. How to change the starting day of the week with WEEKDAY?

You can use the return_type parameter to specify the starting day of the week.

Harness the power of the WEEKDAY formula to refine your data analysis in Excel.