Find max date from a string array of dates using max function of date-fns

Question

Dates string array is constructed from backend data object as below:

const dates: string[] = this.data.map((item:any) => item.date.jsdate);

The result is

dates = [
    Thu Jan 12 2015 00:00:00 GMT+0530 (India Time), 
    Tue Feb 25 2015 00:00:00 GMT+0530 (India Time), 
    Sun Jan 28 2016 00:00:00 GMT+0530 (India Time)
]

typeof(dates) is "object"

How to find the get the latest date among the jsdates array?

Is it possible to apply max function of date-fns?

date-fns.org/v1.29.0/docs/max

David Bulté
– David Bulté

2018-09-25 14:07:16 +00:00
Commented Sep 25, 2018 at 14:07 — David Bulté
– David Bulté, Commented Sep 25, 2018 at 14:07

Luis felipe De jesus Munoz · Accepted Answer · 2018-09-25 14:50:45Z

2

Convert each to a Date object and compare using getTime() function.

var dates = [
    'Thu Jan 12 2015 00:00:00 GMT+0530 (India Time)', 
    'Tue Feb 25 2015 00:00:00 GMT+0530 (India Time)', 
    'Sun Jan 28 2016 00:00:00 GMT+0530 (India Time)'
]

console.log(
  dates.sort((a,b)=>new Date(b).getTime() - new Date(a).getTime())[0]
)

answered Sep 25, 2018 at 14:50

Luis felipe De jesus Munoz

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Comments

Spencer Bard · Accepted Answer · 2018-09-25 13:57:41Z

1

I can offer one solution, using the momentjs (https://momentjs.com/) library.

You can sort the dates using:

dates = dates.sort((a,b) => moment(a).diff(moment(b));

Then if you want the latest date you could take the last element from that array:

return dates[dates.length-1];

You should also be able to do this without moment:

dates = dates.sort((a,b) => new Date(b) - new Date(a));

edited Sep 25, 2018 at 13:57

answered Sep 25, 2018 at 13:50

Spencer Bard

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3 Comments

WebTechie Over a year ago

useful but searching for a solution without using momentjs lib. Thanks.

Ricardo Over a year ago

use the same approach but just converting the date in timestamp and comparing both dates in the sort function

Spencer Bard Over a year ago

Just edited the answer to include a potential solution w/o moment

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