Check if given date is in last 3 weeks

March 24, 2022

I have a sample date:

const date = '10-03-2022';

I need to check if this date is longer than 3 weeks or not. Or speaking differently – I need to check if this date is in the last 3 weeks or older.

I was trying with date-fns but its not the result I expect.

import { formatDistance, subWeeks } from 'date-fns'

formatDistance(subWeeks(new Date(), 3), date)

I dont have to be honest any idea how to deal with such problem. Thats why I wanted to ask you here for help. Thanks!

>Solution :

You can use isAfter to compare against subWeeks. This will return true even if the date is in the future from now.

Alternatively you can use isWithinInterval to test if the date is within the period between now and three weeks before now. (not included in the cdn version available).

const dateIsWithinInterval = isWithinInterval(testDate,
    { start: subWeeks(new Date(), 3), end: new Date() })

You’ll still need to parse your string into a valid Date object.

//import { isAfter, subWeeks } from 'date-fns';
const { isAfter, subWeeks } = dateFns; // cdn assignment

const dateString = '10-06-2022';
const [d, m, y] = dateString.split('-').map(n => parseInt(n, 10));
// months are 0 indexed so you need to subrtract 1.
const testDate = new Date(y, m - 1, d);

const dateIsAfter = isAfter(testDate, subWeeks(new Date(), 3));

console.log('isAfter:', dateIsAfter);

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