How to sort array by date In JavaScript? [duplicate]

Question

I have a problem to sort arrays that are in an array object by date.

I have an array object as below.

[
  {
    "name": "February",
    "plantingDate": "2018-02-04T17:00:00.000Z",
  },
  {
    "name": "March",
    "plantingDate": "2018-03-04T17:00:00.000Z",
  },
  {
    "name": "January",
    "plantingDate": "2018-01-17T17:00:00.000Z",
  }
]

How to sort the array in the array object from January to December, as below.

[
  {
    "name": "January",
    "plantingDate": "2018-01-17T17:00:00.000Z",
  },
  {
    "name": "February",
    "plantingDate": "2018-02-04T17:00:00.000Z",
  },
  {
    "name": "March",
    "plantingDate": "2018-03-04T17:00:00.000Z",
  }
]

I beg for help.

Thank you in advance.

i think it similar to this stackoverflow.com/questions/10123953/… — Fendi jatmiko
– Fendi jatmiko, Commented Sep 12, 2018 at 3:30

adiga · Accepted Answer · 2020-08-16 17:20:14Z

31

Parse strings to get Date objects, then sort by compare function.

var a = [
  {
    "name": "February",
    "plantingDate": "2018-02-04T17:00:00.000Z",
  },
  {
    "name": "March",
    "plantingDate": "2018-03-04T17:00:00.000Z",
  },
  {
    "name": "January",
    "plantingDate": "2018-01-17T17:00:00.000Z",
  }
]

a.sort(function(a,b){
  return new Date(a.plantingDate) - new Date(b.plantingDate)
})

console.log(a)

As Barmar commented,

a.sort(function(a,b){
  return a.plantingDate.localeCompare(b.plantingDate);
})

will also work.

edited Aug 16, 2020 at 17:20

adiga

35.4k9 gold badges65 silver badges88 bronze badges

answered Sep 12, 2018 at 3:31

marmeladze

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3 Comments

Barmar Over a year ago

The comparison function is supposed to return a number, not a boolean. The sign of the number is used to determine the ordering.

Titus Sutio Fanpula Over a year ago

I have tried to do it, but the month is sorted. How can the dates in the month be sorted sir.

Venkey Over a year ago

localeCompare is better. a.dateValue - b.dateValue might work okay with JS. It does not work with TypeScript - wont' compile because of date type. TypeScript expects numeric values including enum.

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