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

To use the setIsoDay function from the date-fns library in TypeScript, you first need to install the library using npm by running the following command in your project directory:

npm install date-fns
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After installing the library, you can import the setIsoDay function in your TypeScript file as follows:

index.ts
import { setISOWeek, setIsoDay } from 'date-fns';
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Once you have imported the function, you can call it with a Date object, a number that represents the day of the week in ISO format, and an optional configuration object that specifies additional options for the function.

Here is an example of how to use the setIsoDay function to set the day of the week of a date to Monday (which has an ISO day value of 1):

index.ts
import { setIsoDay } from 'date-fns';

const date = new Date();
const newDate = setISOWeek(date, 1);
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In this example, the setIsoDay function returns a new Date object with the same year, month, and week as the original date object, but with the day of the week set to Monday (1). Note that the original date object is not modified by the function call.