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

To use the getDayOfYear function from the date-fns library in TypeScript, follow these steps:

1. Install the date-fns library as a dependency in your project:

index.ts
npm install date-fns
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2. Import the getDayOfYear function from date-fns at the top of your TypeScript file:

index.ts
import { getDayOfYear } from 'date-fns';
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3. Declare a Date object and pass it as an argument to the getDayOfYear function. This function returns the day of the year for that particular date:

index.ts
const myDate = new Date('2022-01-01');
const dayOfYear = getDayOfYear(myDate);
console.log(dayOfYear); // Output: 1 (since January 1 is the first day of the year)
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You can also pass a string representing a date to the getDayOfYear function, as long as you use a parseable format:

index.ts
const dayOfYear = getDayOfYear('2022-12-31');
console.log(dayOfYear); // Output: 365 (since December 31 is the 365th day of a non-leap year)
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Note that getDayOfYear returns an integer between 1 and 366 (inclusive), depending on whether the year is a leap year or not.