how to use the set function from the date-fns library in typescript

To use the set function from the date-fns library in TypeScript, first make sure you have installed the library by running npm install date-fns.

Then, import the set function and any other necessary functions from the library as follows:

index.ts
import { set, getYear, getMonth } from 'date-fns';
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You can then use the set function to set specific parts of a Date object. The function takes in a Date object, a unit (such as year, month or day) and a value of that unit to set. For example:

index.ts
const myDate = new Date();
const year = getYear(myDate); // gets the current year
const month = getMonth(myDate); // gets the current month index (0-indexed, where 0 is January)

const newDate = set(myDate, { year: year + 1, month: month + 2 }); // sets the date to one year and two months from the current date
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In this example, we are using the set function to create a new Date object that is one year and two months from the current date.

By passing an object to set with the specific units we want to set, we can easily create a modified Date object with the desired values.

Note that the set function returns a new Date object and does not mutate the original object.