TypeScript - add days to date

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

Example reusable lambda function

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

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

Practical example:

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


// Usage example:

const date: Date = new Date('2022-03-16T23:59:59.000Z');
const result: Date = addDays(date, 1);

console.log(result.toISOString()); // 2022-03-17T23:59:59.000Z

Output:

2022-03-17T23:59:59.000Z