how to get the most recent dates from array of dates in javascript?-CodePudding

Here I am receiving the array of dates like this from the API,

let dates = ["22/1/2022","22/7/2022","9/10/2018"]

From these dates, I need to get the most recent date i.e 22/07/2022.

I got the below example from a site, This code works correctly only if the date matches the format of YYYY/MM/DD.

CODE

function max_date(all_dates) {
  var max_dt = all_dates[0],
    max_dtObj = new Date(all_dates[0]);
  all_dates.forEach(function (dt, index) {
    if (new Date(dt) > max_dtObj) {
      max_dt = dt;
      max_dtObj = new Date(dt);
    }
  });
  return max_dt;
}
console.log(max_date(["2015/02/01", "2022/02/02", "2023/01/03"]));

Can we use some packages like date-fns or momentjs . to get the desired result despite the date format (or) with JS itself its achievable?

Please let me know your solution for this.

CodePudding user response：

With date-fns you can do it like

import { max, parse } from "date-fns"

const dates = ["22/1/2022","22/7/2022","9/10/2018"];

console.log(max(dates.map((d) => parse(d, "d/M/yyyy", new Date()))))
// returns Fri Jul 22 2022 00:00:00 GMT 0200 (Central European Summer Time)

CodePudding user response：

You can use pure Javascript for the logic

Convert strings to dates
Use timestamps (by getTime()) to find max
Convert that max timestamp back to date or string

const dates = ["22/1/2022", "22/7/2022", "9/10/2018"]

const convertStringToDate = (dateString) => {
  const [day, month, year] = dateString.split("/");

  return new Date(year, month - 1, day);
}

function format(inputDate) {
  let date, month, year;

  date = inputDate.getDate();
  month = inputDate.getMonth()   1;
  year = inputDate.getFullYear();

  return `${date}/${month}/${year}`;
}

const timestamps = dates.map(date => convertStringToDate(date).getTime())

const max = Math.max(...timestamps)

console.log(format(new Date(max)))

CodePudding user response：

Sorting in descending order and returning the first element will do the work.

let dates = ['22/1/2022', '22/7/2022', '9/10/2018'];

const latestDate = (dates) => {
  dates.sort((a, b) => {
    const date1 = new Date(a.split('/').reverse().join('-'));
    const date2 = new Date(b.split('/').reverse().join('-'));

    return date2 - date1;
  });

  // First el will be latest date
  return dates[0];
};

console.log(latestDate(dates));
// Output: 22/7/2022