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WEEKDAY function

PRO BASIC

The WEEKDAY function in Jspreadsheet Formulas Pro is a tool that helps you find out the specific day of the week for any given date. When you input a date into this function, it will return a number from 1 to 7, with each number representing a day of the week from Sunday to Saturday. This can be particularly helpful when you're dealing with schedules, planning events, or tracking timelines within your spreadsheet.

Documentation

Returns the day of the week corresponding to a given date.

Category

Date and time

Syntax

WEEKDAY(serial_number, [return_type])

Parameter Description
serial_number The serial number that represents the date whose day of the week you want to find.
[return_type] Optional. A number that determines the type of return value:
1 (or omitted): Numbers 1 (Sunday) through 7 (Saturday)
2: Numbers 1 (Monday) through 7 (Sunday)
3: Numbers 0 (Monday) through 6 (Sunday)
11: Numbers 1 (Monday) through 7 (Sunday)
12: Numbers 1 (Tuesday) through 7 (Monday)
13: Numbers 1 (Wednesday) through 7 (Tuesday)
14: Numbers 1 (Thursday) through 7 (Wednesday)
15: Numbers 1 (Friday) through 7 (Thursday)
16: Numbers 1 (Saturday) through 7 (Friday)
17: Numbers 1 (Sunday) through 7 (Saturday)

Behavior

The WEEKDAY function returns a number representing the day of the week for a given date, starting from either Sunday or Monday, depending on the system settings.

  1. Empty Cells: If the WEEKDAY function is applied to an empty cell, it will return a #VALUE! error as it is expecting a date value.
  2. Text: Applying the WEEKDAY function to a cell containing text (that is not a date) will result in a #VALUE! error.
  3. Booleans: If the WEEKDAY function is applied to a cell containing a Boolean value (TRUE or FALSE), it will treat TRUE as 1 (January 1, 1900) and FALSE as 0 (January 0, 1900) and will return corresponding weekday.
  4. Errors: If the cell to which you apply the WEEKDAY function contains an error, the function will also return that same error.
  5. Numeric values: If a numeric value is used instead of a date, the WEEKDAY function treats it as a serial number representing a date (where 1 is January 1, 1900).

Common Errors

Error Description
#VALUE! This error occurs when the input cell is empty or contains text that is not a date.
#NUM! This error is returned when the input date is out of range (i.e., it is less than January 1, 1900).

Best practices

  • Always ensure that the cell you are applying the WEEKDAY function to contains a valid date or a numeric value representing a date.
  • Use the [return_type] argument to control how weekdays are numbered (e.g., 1 = Sunday through 7 = Saturday, or 1 = Monday through 7 = Sunday).
  • Avoid applying the WEEKDAY function directly to cells that may contain text or errors, as it can result in an error. Use error handling functions to manage this.
  • To get the correct weekday, ensure that the date in the cell is formatted as a date and not as text.

Usage

A few examples using the WEEKDAY function.

WEEKDAY("2022-03-17") returns: 5  
WEEKDAY("2023-01-01", 3) returns: 2  
WEEKDAY("2023-02-22", 2) returns: 4

Interactive Spreadsheet Demo

<html>
<script src="https://jspreadsheet.com/v11/jspreadsheet.js"></script>
<script src="https://jsuites.net/v5/jsuites.js"></script>
<link rel="stylesheet" href="https://jsuites.net/v5/jsuites.css" type="text/css" />
<link rel="stylesheet" href="https://jspreadsheet.com/v11/jspreadsheet.css" type="text/css" />

<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Material+Icons" />
<script src="https://cdn.jsdelivr.net/npm/@jspreadsheet/formula-pro/dist/index.min.js"></script>

<div id="spreadsheet"></div>

<script>
// Set your JSS license key (The following key only works for one day)
jspreadsheet.setLicense('OGUyNGE1MzQ0ZDI1OTdjMDY0OTE2OGVmYzk4ZjhkNzNhMGZlY2Y3ZTNhZjdlYTJmYjUxNTE4YTZkNjZmOGQ3M2Q2YjU5ZjhjOGQyZTc1OTRjOTdmNDlmY2Y4ZDBlYTk0YTM3YTlhYmNlNjI2M2FmMGIyNDM5MjM3OGJlNWU1ZmMsZXlKamJHbGxiblJKWkNJNklpSXNJbTVoYldVaU9pSktjM0J5WldGa2MyaGxaWFFpTENKa1lYUmxJam94TnpVMk56a3pNRGMyTENKa2IyMWhhVzRpT2xzaWFuTndjbVZoWkhOb1pXVjBMbU52YlNJc0ltTnZaR1Z6WVc1a1ltOTRMbWx2SWl3aWFuTm9aV3hzTG01bGRDSXNJbU56WWk1aGNIQWlMQ0p6ZEdGamEySnNhWFI2TG1sdklpd2lkMlZpWTI5dWRHRnBibVZ5TG1sdklpd2lkMlZpSWl3aWJHOWpZV3hvYjNOMElsMHNJbkJzWVc0aU9pSXpOQ0lzSW5OamIzQmxJanBiSW5ZM0lpd2lkamdpTENKMk9TSXNJbll4TUNJc0luWXhNU0lzSW1Ob1lYSjBjeUlzSW1admNtMXpJaXdpWm05eWJYVnNZU0lzSW5CaGNuTmxjaUlzSW5KbGJtUmxjaUlzSW1OdmJXMWxiblJ6SWl3aWFXMXdiM0owWlhJaUxDSmlZWElpTENKMllXeHBaR0YwYVc5dWN5SXNJbk5sWVhKamFDSXNJbkJ5YVc1MElpd2ljMmhsWlhSeklpd2lZMnhwWlc1MElpd2ljMlZ5ZG1WeUlpd2ljMmhoY0dWeklpd2labTl5YldGMElsMHNJbVJsYlc4aU9uUnlkV1Y5');

// Set the extensions
jspreadsheet.setExtensions({ formula });

// Create a new spreadsheet
jspreadsheet(document.getElementById('spreadsheet'), {
  worksheets: [{
    data: [
    [
        "Date",
        "Day of Week (1-7)",
        "Day Name"
    ],
    [
        "2024-01-15",
        "=WEEKDAY(A2)",
        "Monday"
    ],
    [
        "2024-03-22",
        "=WEEKDAY(A3)",
        "Friday"
    ],
    [
        "2024-12-25",
        "=WEEKDAY(A4)",
        "Wednesday"
    ],
    [
        "2024-07-04",
        "=WEEKDAY(A5)",
        "Thursday"
    ]
]
  }]
});
</script>
</html>

import React, { useRef } from "react";
import { Spreadsheet, Worksheet, jspreadsheet } from "@jspreadsheet/react";
import formula from "@jspreadsheet/formula-pro";
import "jsuites/dist/jsuites.css";
import "jspreadsheet/dist/jspreadsheet.css";

// Set license
jspreadsheet.setLicense('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');

// Set the extensions
jspreadsheet.setExtensions({ formula });

export default function App() {
    // Spreadsheet array of worksheets
    const spreadsheet = useRef();

    // Worksheet data
    const data = [
    [
        "Date",
        "Day of Week (1-7)",
        "Day Name"
    ],
    [
        "2024-01-15",
        "=WEEKDAY(A2)",
        "Monday"
    ],
    [
        "2024-03-22",
        "=WEEKDAY(A3)",
        "Friday"
    ],
    [
        "2024-12-25",
        "=WEEKDAY(A4)",
        "Wednesday"
    ],
    [
        "2024-07-04",
        "=WEEKDAY(A5)",
        "Thursday"
    ]
];

    // Render component
    return (
        <Spreadsheet ref={spreadsheet}>
            <Worksheet data={data} />
        </Spreadsheet>
    );
}

<template>
    <Spreadsheet ref="spreadsheet">
        <Worksheet :data="data" />
    </Spreadsheet>
</template>

<script>
import { Spreadsheet, Worksheet, jspreadsheet } from "@jspreadsheet/vue";
import "jsuites/dist/jsuites.css";
import "jspreadsheet/dist/jspreadsheet.css";
import formula from "@jspreadsheet/formula-pro";

// Set license
jspreadsheet.setLicense('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');

// Set the extensions
jspreadsheet.setExtensions({ formula });

export default {
    components: {
        Spreadsheet,
        Worksheet,
    },
    data() {
        // Worksheet data
        const data = [
    [
        "Date",
        "Day of Week (1-7)",
        "Day Name"
    ],
    [
        "2024-01-15",
        "=WEEKDAY(A2)",
        "Monday"
    ],
    [
        "2024-03-22",
        "=WEEKDAY(A3)",
        "Friday"
    ],
    [
        "2024-12-25",
        "=WEEKDAY(A4)",
        "Wednesday"
    ],
    [
        "2024-07-04",
        "=WEEKDAY(A5)",
        "Thursday"
    ]
]

        return {
            data
        };
    }
}
</script>

import { Component, ViewChild, ElementRef } from "@angular/core";
import jspreadsheet from "jspreadsheet";
import * as formula from "@jspreadsheet/formula-pro";

// Set your JSS license key (The following key only works for one day)
jspreadsheet.setLicense('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');

// Set the extensions
jspreadsheet.setExtensions({ formula });

@Component({
    standalone: true,
    selector: "app-root",
    template: `<div #spreadsheet></div>`
})
export class AppComponent {
    @ViewChild("spreadsheet") spreadsheet: ElementRef;
    // Worksheets
    worksheets: jspreadsheet.worksheetInstance[];

    // Create a new data grid
    ngAfterViewInit() {
        // Create spreadsheet
        this.worksheets = jspreadsheet(this.spreadsheet.nativeElement, {
            worksheets: [{
                data: [
    [
        "Date",
        "Day of Week (1-7)",
        "Day Name"
    ],
    [
        "2024-01-15",
        "=WEEKDAY(A2)",
        "Monday"
    ],
    [
        "2024-03-22",
        "=WEEKDAY(A3)",
        "Friday"
    ],
    [
        "2024-12-25",
        "=WEEKDAY(A4)",
        "Wednesday"
    ],
    [
        "2024-07-04",
        "=WEEKDAY(A5)",
        "Thursday"
    ]
]
            }]
        });
    }
}

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