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JavaScript - subtract years from date

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Created by:

Dexter

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In this article, we would like to show you how to subtract years from date in JavaScript.

Quick solution:

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const date = new Date('2021-06-30');
​
date.setYear(date.getFullYear() - 2); // subtracted 2 years from existing date
​
console.log(date.toISOString());      // 2019-06-30T00:00:00.000Z

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1. Example reusable lambda function

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In this example, we create a simple lambda function that takes two arguments:

date from which we want to subtract some years,
years - number of years we want to subtract.

Runnable example:

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const subtractYears = (date, years) => {
  const result = new Date(date);
  result.setFullYear(result.getFullYear() - years);
  return result;
};
​
​
// Usage example:
​
const date = new Date('2021-06-30');
const newDate = subtractYears(date, 2); // subtracted 2 years from existing date
​
console.log(newDate.toISOString()); // 2019-06-30T00:00:00.000Z

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Output:

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2019-06-30T00:00:00.000Z

2. Extending existing `Date` class with `Date.prototype`

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In this example, we add a function to the Date.prototype, so we can use it on any date object.

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Date.prototype.subtractYears = function (years) {
  this.setFullYear(this.getFullYear() - years);
};
​
// Usage example:
​
const date = new Date('2021-06-30');
date.subtractYears(2); // subtracted 2 years from existing date
​
console.log(date.toISOString()); // 2019-06-30T00:00:00.000Z