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How to get the current weekday date in JavaScript

I have a function that takes the desired day number and ultimately I want it to be able to return the date of that day in the current week, given the day number it takes. This is my code.

function getDateForDayInWeek(day) {
    const today = new Date();
    const currentDay = (today.getDay() + 1) % 7;
    const adjustedDay = currentDay === 0 ? 6 : currentDay - 1;
    const daysToAdjust = (day - adjustedDay + 7) % 7;

    today.setDate(today.getDate() + daysToAdjust);

    // Formatting the date to YYYY-MM-DDTHH:mm:ss
    return today.toISOString().slice(0, 19);
}


console.log(getDateForDayInWeek(6)); //  2024-12-21 ,Saturday
console.log(getDateForDayInWeek(0)); //  2024-12-22 ,Sunday
console.log(getDateForDayInWeek(5)); //  2024-12-27 ,Friday
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2

Answers


  1. 0

    To get the current weekday’s date in JavaScript, you can use the Date object and manipulate it to get the date of a specific day in the current week based on a given day number.

    Here’s the breakdown of the function:

    function getDateForDayInWeek(day) {
    const today = new Date();  // Get today's date
    const currentDay = today.getDay();  // Get the current day of the week (0 for Sunday, 1 for Monday, etc.)

    // Calculate how many days to adjust to reach the desired day in the current week
    const daysToAdjust = (day - currentDay + 7) % 7;

    today.setDate(today.getDate() + daysToAdjust);  // Adjust the date to the desired day
    
    // Format the date in the 'YYYY-MM-DDTHH:mm:ss' format
    return today.toISOString().slice(0, 19);
}

console.log(getDateForDayInWeek(6));  // Output: '2024-12-21T00:00:00' (Saturday)
console.log(getDateForDayInWeek(0));  // Output: '2024-12-22T00:00:00' (Sunday)
console.log(getDateForDayInWeek(5));  // Output: '2024-12-27T00:00:00' (Friday)

    Explanation:

    1. today.getDay() returns the current day as a number (0 for Sunday, 1 for Monday, etc.).
    2. The expression (today.getDay() + 1) % 7 adjusts the current day so that Monday is 0, Tuesday is 1, and so on (making it easier to compare).
      adjustedDay ensures that Sunday is considered as 6 (instead of 0).
    3. daysToAdjust calculates the number of days to add or subtract to reach the desired day number.
    4. The date is adjusted with today.setDate(today.getDate() + daysToAdjust).
      toISOString() is used to format the date in a consistent format, and .slice(0, 19) removes the milliseconds part.

    This code will return the date for the given day number in the current week.

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  2. 0

    Try this:

    function getDateForDayInWeek(targetDay) {
        const today = new Date();
        const currentDayOfWeek = today.getDay(); // Returns 0-6 (Sunday-Saturday)
        const daysToAdjust = targetDay - currentDayOfWeek;
        
        const resultDate = new Date(today);
        resultDate.setDate(today.getDate() + daysToAdjust);
        
        return resultDate.toISOString().slice(0, 10); // Returns only YYYY-MM-DD
    }

    The key difference is that it now correctly calculates the dates for the current week without unnecessary complexity in the day calculations.

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