How to check if a date is today in JavaScript

From a JavaScript date instance, we can get the day, month and year values by using getDate(), getMonth() and getFullYear() methods:

// month is zero-based (0-11)
const date = new Date(2022, 7, 7)

date.getDate() // 7
date.getMonth() // 7
date.getFullYear() // 2022

Now let's create a small function that takes a date as an argument and compares the above values to today's date values, and returns true if both are the same:

const isToday = date => {
  const today = new Date()
  return date.getDate() === today.getDate() && 
      date.getMonth() === today.getMonth() && 
      date.getFullYear() === today.getFullYear()
}

Here is how you can use it:

const date = new Date(2022, 7, 7)
console.log(isToday(date)) // true

Alternatively, you can extend the date object by adding the above function directly to object prototype like below:

Date.prototype.isToday = function () {
  const today = new Date()
  return this.getDate() === today.getDate() && 
      this.getMonth() === today.getMonth() && 
      this.getFullYear() === today.getFullYear()
}

Now just call the isToday() method on any date object to compare it with today's date:

const date = new Date(2022, 7, 7)
console.log(date.isToday())

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