TypeScript - subtract days from date

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

Quick solution:

const date: Date = new Date('2021-06-30');
date.setDate(date.getDate() - 2); // subtracted 2 days from existing date

console.log(date.toISOString()); // 2021-06-28T00:00:00.000Z

or:

const date: Date = new Date('2021-06-30');
const newDate: Date = new Date(date.getTime() - 2 * (24 * 60 * 60 * 1000)); // subtracted 2 days from existing date

console.log(newDate.toISOString()); // 2021-06-28T00:00:00.000Z

Example reusable lambda function

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

• date from which we want to subtract some days,
• days - a number of days we want to subtract.

Practical example:

const subtractDays = (date: Date, days: number): Date => {
  const result = new Date(date);
  result.setDate(result.getDate() - days);
  return result;
};

const date = new Date('2021-06-30');
const result = subtractDays(date, 3);

console.log(result.toISOString()); // 2021-06-27T00:00:00.000Z

Output:

2021-06-27T00:00:00.000Z