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

The setIsODay function from the date-fns library in JavaScript is used to set the day of the month to the nearest specified ordinal number. Here is an example of how to use this function:

index.tsx
import { setIsODay } from 'date-fns';

const date = new Date(2022, 2, 15); // March 15th, 2022
const newDate = setIsODay(date, 2); // Set the day to the 2nd ordinal day of the month

console.log(newDate); // Output: Tue Mar 01 2022 00:00:00 GMT-0800 (Pacific Standard Time)
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In this example, we import the setIsODay function from the date-fns library. We create a new Date object for March 15th, 2022, and then call setIsODay on that object and pass in the desired ordinal day of the month, which in this case is 2.

The function returns a new Date object with the day set to the desired ordinal day. In this case, the new date returned is March 1st, 2022, which is the nearest 2nd ordinal day of the month.

Note that the setIsODay function does not modify the original date object—it returns a new date object with the specified day set to the nearest ordinal value.