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

Here's an example of how to use the endOfDay function from the date-fns library in TypeScript:

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

const someDate = new Date('2021-01-01T12:34:56'); // create a Date object
const endOfSomeDate = endOfDay(someDate); // obtain the end of the day for someDate

console.log(endOfSomeDate); // output: 2021-01-01T23:59:59.999Z
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The endOfDay function takes a Date object as an argument and returns a new Date object with the time set to the end of the day (i.e., 23:59:59.999).

Note that endOfDay does not modify the original Date object, but returns a new one. Also, the returned Date object is in UTC (Coordinated Universal Time) by default, so you may need to adjust it to your local time zone if necessary.