How can I calculate age in X years, X months & X days

[nitin2953]

I'm a beginner in javascript want to build a age calculator, I can get diff in total days, months & years but I want it in:

let startD = new Date(2003, 4, 29);
let endD = new Date();
// age = 18 years 11 months 0 days

[tan75]

Hello,

is this the one?

import { formatDuration, intervalToDuration } from "date-fns";

const startDate = new Date(2003, 4, 29);
const endDate = new Date();

const duration = intervalToDuration({ start: startDate, end: endDate });

const age = formatDuration(duration, { format: ["years", "months", "days"] });

console.log(age); //=> '18 years 11 months 12 days'

[nitin2953]

Thank you very much

[nitin2953]

Now I use Temporal API, it is more accurate than date-fns (which show "32 Days" not "1 Month 1 Days")

[tan75]

@nitin2953 can you please provide the dates you used for the calculation when you got the result of 32 days?

[nitin2953]

Using "date-fns console" v2.16.1, same case in 2.28.0

function dfns(date1, date2 = new Date) {
	let startDate = new Date(date1);
	let endDate = new Date(date2);

	let duration = _.intervalToDuration({ start: startDate, end: endDate });
	// let age = _.formatDuration(duration, { format: ["years", "months", "days"] });

	return console.log(duration);
}

dfns("2022-02-28", "2022-04-25");
// {years: 0, months: 1, days: 28, hours: 0, minutes: 0, …}

dfns("2022-02-28", "2022-04-26");
// {years: 0, months: 1, days: 29, hours: 0, minutes: 0, …}

dfns("2022-02-28", "2022-04-27");
// {years: 0, months: 1, days: 30, hours: 0, minutes: 0, …}

dfns("2022-02-28", "2022-04-28");
// {years: 0, months: 1, days: 31, hours: 0, minutes: 0, …}

dfns("2022-02-28", "2022-04-29");
// {years: 0, months: 1, days: 32, hours: 0, minutes: 0, …}

dfns("2022-02-28", "2022-04-30");
// {years: 0, months: 1, days: 33, hours: 0, minutes: 0, …}

dfns("2022-02-28", "2022-04-31");
// {years: 0, months: 2, days: 3, hours: 0, minutes: 0, …}

dfns("2022-02-28", "2022-05-01");
// {years: 0, months: 2, days: 3, hours: 0, minutes: 0, …}

dfns("2022-02-28", "2022-05-02");
// {years: 0, months: 2, days: 4, hours: 0, minutes: 0, …}

dfns("2022-02-28", "2022-05-03");
// {years: 0, months: 2, days: 5, hours: 0, minutes: 0, …}