How to get 30 days prior to current date?

Question

I have a start calendar input box and an end calendar input box. We want defaults start calendar input box 30 days prior to current date and the end calendar input box to be the current date. Here is my date vars.

var today = new Date(),
    dd    = today.getDate(),
    mm    = today.getMonth(),
    yyyy  = today.getFullYear(),
    month = ["January", "February", "March",
        "April", "May", "June", "July", "August",
        "September", "October" "November", "December"],
    startdate = month[mm] + ", " + yyyy.toString();

The end date would be something like var enddate = startdate - 30; Obviously this won't work.

So if the current date is December 30, 2011 I'd want the start date to read December 1, 2011.

EDIT: My question was answered... sort of. Date.today(); and Date.today().add(-30); work but I need the date in the format of January 13, 2012. Not Fri Jan 13 2012 10:48:56 GMT -055 (EST). Any help?

MORE EDIT: As of this writing it's 2018. Just use Moment.js. It's the best.

http://stackoverflow.com/questions/563406/add-days-to-datetime-using-java-script I think that might help. — Tim Withers, Jan 12 '12 at 21:41

Rory McCrossan · Answer 1 · 2022-01-10T19:21:37.610

228

To subtract days from a JS Date object you can use the setDate() method, along with the date to start the calculation from. This will return an epoch timestamp as an integer, so to convert this to a Date you'll need to again provide it to the Date() object constructor. The final example would look like this:

var today = new Date();
var priorDate = new Date(new Date().setDate(today.getDate() - 30));

console.log(today)
console.log(priorDate);

edited Jan 10 '22 at 19:21

answered Jan 12 '12 at 21:42

Rory McCrossan

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Without using an external library I like this solution the best. Thanks. – Gowiem Oct 27 '14 at 17:34
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Note that this method returns in Javascript Timestamp format. To convert it back to date object, you need to pass the above to `new Date(priorDate)` – Neel Jun 29 '15 at 18:23
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Sometimes you just want vanilla js without a library! Thanks :) – Andrew McOlash Nov 05 '19 at 06:29
I get setDate() is not a function – chovy Jan 08 '20 at 22:21
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@chovy the only way I can imagine you're getting that error is because you're not calling `setDate()` on a `Date` object. It's impossible to diagnose without seeing your code, though. – Rory McCrossan Jan 09 '20 at 08:32

score 172 · Accepted Answer · edited Jan 18 '15 at 16:56

172

Try using the excellent Datejs JavaScript date library (the original is no longer maintained so you may be interested in this actively maintained fork instead):

Date.today().add(-30).days(); // or...
Date.today().add({days:-30});

[Edit]

See also the excellent Moment.js JavaScript date library:

moment().subtract(30, 'days'); // or...
moment().add(-30, 'days');

edited Jan 18 '15 at 16:56

Dylan Valade

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answered Jan 12 '12 at 21:41

maerics

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I was struggling to get the start and end dates 30 days before and after today in UTC without the time. This worked: `moment( moment().subtract(30, 'days') ).format("YYYY-MM-DD")` – Dylan Valade Jan 18 '15 at 17:08
6

I used the `moment()` approach and appended the `toDate()` method to get back the JavaScript date object. Thanks! – Brylie Christopher Oxley Apr 14 '17 at 12:22
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Why would you need to use a library for this? That seems crazy. – Harry Dec 12 '17 at 13:51
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can you recommend a library for console.log ? – Andre Elrico Jan 31 '20 at 14:02
The first answer doesn't work check this link instead https://stackoverflow.com/questions/563406/add-days-to-javascript-date – alexalejandroem Jun 10 '21 at 12:44

score 108 · Answer 3 · answered Jul 27 '15 at 23:47

108

Here's an ugly solution for you:

var date = new Date(new Date().setDate(new Date().getDate() - 30));

answered Jul 27 '15 at 23:47

Nahn

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Hilariously this is the best solution. – Mark Rogers Dec 05 '15 at 05:48
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Agreed - this is the best solution. This is *exactly* the solution of Rory McCrossan's answer - but concise, and complete (no external libraries required). – Dan Nissenbaum May 19 '16 at 18:55
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@MarkRogers "Hilariously" is the right word. JavaScript dates are truly absurd. – JosephStyons Jan 19 '17 at 16:07
Yes this is a simple and best solution. – Sachini Witharana Sep 03 '20 at 07:02
Ugly can be elegant. This is – doublejosh Oct 20 '21 at 23:27

score 50 · Answer 4 · answered Jan 12 '12 at 21:41

50

startDate = new Date(today.getTime() - 30*24*60*60*1000);

The .getTime() method returns a standard JS timestamp (milliseconds since Jan 1/1970) on which you can use regular math operations, which can be fed back to the Date object directly.

answered Jan 12 '12 at 21:41

Marc B

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WasiF · Answer 5 · 2021-10-24T07:14:18.280

Get next 30th day from today

let now = new Date()
console.log('Today: ' + now.toUTCString())
let next30days = new Date(now.setDate(now.getDate() + 30))
console.log('Next 30th day: ' + next30days.toUTCString())

Get last 30th day form today

let now = new Date()
console.log('Today: ' + now.toUTCString())
let last30days = new Date(now.setDate(now.getDate() - 30))
console.log('Last 30th day: ' + last30days.toUTCString())

score 7 · Answer 6 · answered Aug 01 '18 at 10:16

7

Javascript can handle it without any external libraries.

var today = new Date();
var dateLimit = new Date(new Date().setDate(today.getDate() - 30));

document.write(today + "<br/>" + dateLimit)

answered Aug 01 '18 at 10:16

Freddy

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Christopher Fernandes · Answer 7 · 2020-09-17T20:04:27.653

Simple 1 liner Vanilla Javascript code :

const priorByDays = new Date(Date.now() - days * 24 * 60 * 60 * 1000)

For example: days = 7 Assume current date = Fri Sep 18 2020 01:33:26 GMT+0530

The result would be : Fri Sep 11 2020 01:34:03 GMT+0530

The beauty of this is you can manipulate it to get result in desired type

timestamp : Date.now() - days * 24 * 60 * 60 * 1000
ISOString: new Date(Date.now() - 7 * 24 * 60 * 60 * 1000).toISOString()

manish kumar · Answer 8 · 2020-05-13T18:15:22.243

6

Easy.(Using Vanilla JS)

let days=30;
this.maxDateTime = new Date(Date.now() - days * 24 * 60 * 60 * 1000);

ISOFormat ?

let days=30;
this.maxDateTime = new Date(Date.now() - days * 24 * 60 * 60 * 1000).toISOString();

edited May 13 '20 at 18:15

answered Jun 21 '18 at 17:11

manish kumar

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score 5 · Answer 9 · answered Jun 15 '20 at 13:03

5

let today = new Date()

let last30Days = new Date(today.getFullYear(), today.getMonth(), today.getDate() - 30)

last30Days will be in Date Object

answered Jun 15 '20 at 13:03

Kevin Chandra

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score 4 · Answer 10 · edited Jun 29 '15 at 18:24

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I will prefer moment js

startDate = moment().subtract(30, 'days').format('LL')  // January 29, 2015

endDate = moment().format('LL'); // February 28, 2015

edited Jun 29 '15 at 18:24

Rory McCrossan

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answered Feb 28 '15 at 15:37

Linoy

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score 2 · Answer 11 · edited Aug 13 '18 at 22:39

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This is an ES6 version

let date = new Date()
let newDate = new Date(date.setDate(date.getDate()-30))
console.log(newDate.getMonth()+1 + '/' + newDate.getDate() + '/' + newDate.getFullYear() )

edited Aug 13 '18 at 22:39

CDspace

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answered Aug 13 '18 at 21:20

Lawrence Edmondson

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How is this different from any of the other answers, like [this one](https://stackoverflow.com/a/31665235)? Also, there's nothing here that couldn't have been done in ES5... or ES3 even. – Heretic Monkey Aug 13 '18 at 21:27

score 2 · Answer 12 · answered Jan 12 '12 at 21:40

2

I use date.js. It handles this easily and takes care of all the leap-year nastiness.

answered Jan 12 '12 at 21:40

Diodeus - James MacFarlane

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score 1 · Answer 13 · answered Jan 09 '19 at 10:25

You can do that simply through 1 line of code using moment in Node JS. :)

    let lastOneMonthDate = moment().subtract(30,"days").utc().toISOString()

Don't want UTC format, EASIER :P

    let lastOneMonthDate = moment().subtract(30,"days").toISOString()

score 1 · Answer 14 · answered Sep 23 '19 at 09:16

If you aren't inclined to momentjs, you can use this:

let x = new Date()

x.toISOString(x.setDate(x.getDate())).slice(0, 10)

Basically it gets the current date (numeric value of date of current month) and then sets the value. Then it converts into ISO format from which I slice down the pure numeric date (i.e. 2019-09-23)

Hope it helps someone.

score 0 · Answer 15 · answered Jun 17 '21 at 06:18

0

Use moment.js

let startDate =  moment().subtract(30, "days").format('YYYY-MM-DD'); //2021-05-18
let endDate = moment().format('YYYY-MM-DD'); //2021-06-17

answered Jun 17 '21 at 06:18

Gautam Kumar

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score 0 · Answer 16 · answered Dec 28 '21 at 06:57

For anyone looking for the format 'dd month yyyy', here's what worked for me:

let date = new Date()

let newDate = new Date(date.setDate(date.getDate()-30))

console.log(newDate.getDate()+ ' ' +newDate.toLocaleString('default', {month: 'long'}) + ' ' + newDate.getFullYear() )

How to get 30 days prior to current date?

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