how to use the getisoday function from date-fns in javascript

To use the getISODay function from date-fns in JavaScript, first you need to install the package by running the following command in your terminal:

index.tsx
npm install date-fns
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Then, import the getISODay function in your JavaScript file:

import { getISODay } from 'date-fns';
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Now, you can use the getISODay function to get the day of the week in ISO format (1 for Monday, 2 for Tuesday, ..., 7 for Sunday) for a given Date object:

const date = new Date('2022-01-24'); // Monday
const isoDay = getISODay(date); // 1
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You can also use the getISODay function with a Unix timestamp:

const unixTimestamp = 1643136000000; // 2022-01-24T00:00:00.000Z (Monday)
const isoDay = getISODay(unixTimestamp); // 1
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Note that the getISODay function returns a number between 1 (Monday) and 7 (Sunday).