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

To use the endOfQuarter function from the date-fns library in TypeScript, you can follow the following steps:

1. Install the date-fns library using your favorite package manager. For example, using NPM:

npm install date-fns
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2. Import the endOfQuarter function from the date-fns library:

index.ts
import { endOfQuarter } from 'date-fns'
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3. Use the endOfQuarter function with a Date object as input to get the end of the quarter for that date:

index.ts
const date = new Date('2022-03-20')
const endOfQuarter = endOfQuarter(date)
console.log(endOfQuarter) // Output: 2022-03-31T23:59:59.999Z
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Note that the endOfQuarter function returns a Date object that represents the end of the quarter for the given input date.

You can also provide an optional options object to the endOfQuarter function to customize the behavior of the function. For example, you can use the weekStartsOn option to specify which day of the week should be considered the start of the week. Here is an example:

index.ts
const date = new Date('2022-03-20')
const options = { weekStartsOn: 1 } // Monday is the first day of the week
const endOfQuarter = endOfQuarter(date, options)
console.log(endOfQuarter) // Output: 2022-03-31T23:59:59.999Z
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