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  3. JavaScript — Check if a Date is on a Weekend or Weekday

JavaScript — Check if a Date is on a Weekend or Weekday

Working with dates may involve checking whether a given date is a weekday or a weekend. For example, you don’t want to send an email on weekends but on weekdays, and vice versa. This tutorial shows you how to determine whether a given JavaScript date is a weekend or weekday.

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Check if a Date is on a Weekend in JavaScript

The following code snippet outlines how to check whether a given date is on a weekend. We’re using the Date#getDay function to retrieve the number for the day of the week. This number is according to the local time and represents a day between 0 and 6:

  • 0=Sunday
  • 1=Monday
  • 2=Tuesday
  • …
  • 6=Saturday

The numbers for Saturday 6 and Sunday 0 are a multiple of 6 and we can use the modulo operator to check for a remainder of 0 to detect the weekend:

function isWeekend(date) {  
  if (date instanceof Date) {
    return date.getDay() % 6 === 0
  }

  throw new Error('Cannot check if date is weekend: [date] parameter is not a Date')
}

Check if a Date is a Weekday in JavaScript

For weekdays, we’re using Date#getDay as well to retrieve the number for the day of the week. This time we’re checking for a remainder other than 0 to detect the days Monday to Friday:

function isWeekday(date) {  
  if (date instanceof Date) {
    return date.getDay() % 6 !== 0
  }

  throw new Error('Cannot check if date is week day: [date] parameter is not a Date')
}

That’s it!

Mentioned Resources

Marcus Pöhls

Marcus is a fullstack JS developer. He’s passionate about the hapi framework for Node.js and loves to build web apps and APIs. Creator of Futureflix and the “learn hapi” learning path.

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