CODEWITHSUNDEEP
javascriptdate
Tom
Tom

Reputation: 12998

javascript - compare dates in different formats

I have 2 dates which I need to compare to see if one is greater than the other but they are in different formats and I'm not sure of the best way to compare the 2.

The formats are:

1381308375118 (this is var futureDate)

which is created by

var today = new Date(); today.setHours(0, 0, 0, 0); var futureDate = new Date().setDate(today.getDate() + 56); //56 days in the future...

And the other format is

2013/08/26

Any ideas how I can compare the 2?

Upvotes: 8

Views: 16513

Answers (5)

WasiF
WasiF

Reputation: 28939

Follow these steps to compare dates

Each of your date must to passed through Date object i.e. new Date(yourDate). Now dates will have same format and these will be comparable

let date1 = new Date()

let date2 = "Jan 1, 2019"

console.log(`Date 1: ${date1}`)
console.log(`Date 2: ${date2}`)

let first_date = new Date(date1)
let second_date = new Date(date2)

// pass each of the date to 'new Date(yourDate)'
// and get the similar format dates

console.log(`first Date: ${first_date}`)
console.log(`second Date: ${second_date}`)

// now these dates are comparable

if(first_date > second_date) {
  console.log(`${date2} has been passed`)
}

Upvotes: 0

Xotic750
Xotic750

Reputation: 23502

I would make sure that I am comparing the "date" element of each format and exclude any "time" element. Then with both dates converted to milliseconds, simply compare the values. You could do something like this. If dates are equal it returns 0, if the first date is less that the second then return -1, otherwise return 1.

Javascript

function compareDates(milliSeconds, dateString) {
    var year,
        month,
        day,
        tempDate1,
        tempDate2,
        parts;

    tempDate1 = new Date(milliSeconds);
    year = tempDate1.getFullYear();
    month =  tempDate1.getDate();
    day = tempDate1.getDay();
    tempDate1 = new Date(year, month, day).getTime();

    parts = dateString.split("/");
    tempDate2 = new Date(parts[0], parts[1] - 1, parts[2]).getTime();

    if (tempDate1 === tempDate2) {
        return 0;
    }

    if (tempDate1 < tempDate2) {
        return -1;
    }

    return 1;
}

var format1 = 1381308375118,
    format2 = "2013/08/26";

console.log(compareDates(format1, format2));

On jsfiddle

Upvotes: 1

Castrohenge
Castrohenge

Reputation: 8993

Without using a 3rd party library, you can create new Date objects using both those formats, retrieve the number of milliseconds (since midnight Jan 1, 1970) using getTime() and then simply use >:

new Date("2013/08/26").getTime() > new Date(1381308375118).getTime()

Upvotes: 19

r.piesnikowski
r.piesnikowski

Reputation: 2971

I strongly recommend using datejs library.

Thus this can be written in one single line:

Date.today().isAfter(Date.parse('2013/08/26'))

Upvotes: 2

ymonad
ymonad

Reputation: 12120

Maybe you can use Date.parse("2013/08/26") and compare with former one

Upvotes: 0

Related Questions