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

To use the endofhour function from the date-fns library in TypeScript, you need to install the library first. You can do that by running the following command in your terminal:

index.ts
npm install date-fns
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After the installation, you can import the endofhour function from the library into your TypeScript file as shown below:

index.ts
import {endOfHour} from 'date-fns';
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The endofhour function takes a date object as its argument and returns the end of the hour for that date. Here's an example of how to use it:

index.ts
const today = new Date();
const endOfHour = endofhour(today);
console.log(endOfHour); // Output: 2022-03-25T01:59:59.999Z
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In the above example, we first create a new Date object to represent the current date and time. Next, we pass this date object to the endofhour function, which returns the end of the hour for that date. Finally, we log the result to the console.

Note that the endofhour function returns the end of the hour in UTC timezone by default. If you want to get the end of the hour in a specific timezone, you can use the zonedTimeToUtc function from the date-fns-tz library to convert the input date into UTC timezone. Here's an example:

index.ts
import {endOfHour, zonedTimeToUtc} from 'date-fns-tz';

const dateStr = '2022-03-25T10:15:00+05:30';
const date = new Date(dateStr);
const utcDate = zonedTimeToUtc(date, 'Asia/Kolkata');
const endOfHourInLocalTimezone = endOfHour(utcDate);
console.log(endOfHourInLocalTimezone); // Output: 2022-03-25T05:29:59.999Z
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In the above example, we use the zonedTimeToUtc function to convert the input date (in the Asia/Kolkata timezone) to UTC timezone before passing it to the endOfHour function. This ensures that the end of the hour is calculated correctly, regardless of the timezone of the input date.