Javascript - get 1 oldest date from array of dates

Question

I have an array with this format. I just want to pull the 1 oldest date.

This is value in array looks like:

Array:

creationDate = ['Wed Feb 13 21:14:55 GMT 2019','Wed Feb 13 21:19:42 GMT 2019','Wed Feb 13 21:28:29 GMT 2019','Wed Feb 13 21:31:04 GMT 2019'];

This is my code:

Code:

        // this below code is not working as expected   
        if(creationDate){
            var orderedDates = creationDate.sort(function(a,b){
                return Date.parse(a) > Date.parse(b);
            }); 
        }

Expected Result:

Wed Feb 13 21:14:55 GMT 2019

Try using Date.parse(a) - Date.parse(b) (or switch a and b to sort in the opposite order). The compare function expects a number to be returned rather than a boolean. Check rules for thee compare function here: developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/… — Khauri
– Khauri, Commented Mar 20, 2019 at 23:36

Ori Drori · Accepted Answer · 2019-03-20 23:39:00Z

6

You can use Array.reduce() and on each iteration compare the dates and take the oldest:

const creationDate = ['Wed Feb 13 21:14:55 GMT 2019','Wed Feb 13 21:19:42 GMT 2019','Wed Feb 13 21:28:29 GMT 2019','Wed Feb 13 21:31:04 GMT 2019'];

const oldest = creationDate.reduce((c, n) => 
  Date.parse(n) < Date.parse(c) ? n : c
);

console.log(oldest);

answered Mar 20, 2019 at 23:39

Ori Drori

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1 Comment

Mike Mellor Over a year ago

Better than sorting as it doesn't mutate the original array like sort does.

Allen · Accepted Answer · 2020-05-21 02:10:48Z

5

You want to return a number, not a Boolean (so use - not >):

var creationDate = ['Wed Feb 13 21:14:55 GMT 2019', 'Wed Feb 13 21:19:42 GMT 2019', 'Wed Feb 13 21:28:29 GMT 2019', 'Wed Feb 13 21:31:04 GMT 2019', 'Wed Feb 13 21:33:04 GMT 2019'];
var orderedDates = creationDate.sort(function(a, b) {
  return Date.parse(a) - Date.parse(b);
});
console.log(orderedDates[0]);

edited May 21, 2020 at 2:10

Allen

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answered Mar 20, 2019 at 23:39

Jack Bashford

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Comments

Liondj · Accepted Answer · 2019-03-20 23:36:54Z

1

Try:

if(creationDates){
  return creationDates.sort()[0]
}

answered Mar 20, 2019 at 23:36

Liondj

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