Round moment.js object time to nearest 30 minute interval

Question

I was trying to round the moment.js time object to next nearest 30 minute interval. But looks my logic us wrong.

Ex:

10:13am -> 10:30am
11:45am -> 12:00pm

Here is my current code

start = moment();
minuteReminder = start.minute() % 30;
start.add(minuteReminder, 'minutes');
start.format("D YYYY, h:mm:ss a");

You are finding the remainder, not the difference. You need to do both, as per my solution. — jtromans, Aug 15 '14 at 09:21
[This](http://stackoverflow.com/a/28561371/2393573) works for me, it's really good solution. — sandeep.gosavi, Apr 30 '16 at 04:30

score 157 · Accepted Answer · edited Oct 20 '21 at 10:05

157

Edit 2021 : easiest solution

const start = moment('2018-12-08 09:42');
const remainder = 30 - (start.minute() % 30);
 
const dateTime = moment(start).add(remainder, "minutes").format("DD.MM.YYYY, h:mm:ss a");

console.log(dateTime);

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.20.1/moment.min.js"></script>

Million ways to do this. You don't need moment.js really. Anyway, here is one.

edited Oct 20 '21 at 10:05

crg

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answered Aug 15 '14 at 09:12

jtromans

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I think you are making a mistake , ``` remainder = (moment().minute()%30)-30``` – 32teeths May 24 '16 at 14:28
5

I think it should be `code` 30 - (start.minute() % 30) – artem_p Nov 15 '16 at 14:51
2

people that find this might want to include `.startOf('minute')` in order to reset seconds and milliseconds of the intrinsic date object. – Adrian Föder May 02 '20 at 16:44
2

This doesn't seem to do what was asked for. Even the sample snippet doesn't round 09:42 to the _nearest_ 30 minute interval; it rounds it to the _next_ 30 minute interval. The result should be 09:30, not 10:00. – Vala Jul 25 '20 at 12:50
1

The OP provided a number of examples in their original question, and this addresses those examples. The title of the post is ambiguous. – jtromans Aug 21 '20 at 09:19
1

This solution is broken - it adds 30min. if the date is already rounded. – hon2a Jun 06 '22 at 09:03

score 70 · Answer 2 · answered Sep 22 '16 at 11:33

70

Based on @Volune and @Cabloo answers and comments, an updated version can look like:

function round(date, duration, method) {
    return moment(Math[method]((+date) / (+duration)) * (+duration)); 
}

Which then can be used like:

var date = moment();
var roundedDate = round(date, moment.duration(15, "minutes"), "ceil");

answered Sep 22 '16 at 11:33

janhartmann

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Brilliant way to allow extended functionality! – mdmb Feb 02 '18 at 01:32
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Probably makes sense to restore the original timezone, otherwise this information gets lost. F.e. by adding .tz(date.tz()) to the end. – XZen Jun 20 '18 at 12:36

score 38 · Answer 3 · answered Aug 15 '14 at 09:27

38

A generic solution:

var ROUNDING = 30 * 60 * 1000; /*ms*/
start = moment();
start = moment(Math.ceil((+start) / ROUNDING) * ROUNDING);
start.format("D YYYY, h:mm:ss a");

You can change ROUNDING from 30 minutes to whatever you want, and change Math.ceil by Math.round or Math.floor if you want another way to round the value.

answered Aug 15 '14 at 09:27

Volune

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I like this one. You could convert the ROUNDING variable to a moment.duration(...), i.e. `function date_round(date, duration) { return moment(Math.floor((+date)/(+duration)) * (+duration)); }` Used like so `date_round(moment(), moment.duration(30, 'minutes'))` – Zane Sep 03 '14 at 01:47

score 4 · Answer 4 · answered Apr 09 '20 at 09:02

You could do it with two ifs:

// Current date
let now = moment();

// Getting hour and minute
let hour   = now.hour();
let minute = now.minute();

// Rounding minute on 30 mins interval
if(minute <= 30) now.set({minute: 30});
if(minute >  30) now.set({hour: hour + 1, minute: 0});

score 3 · Answer 5 · edited Jan 30 '21 at 19:27

3

You can do it by a simple if-else clause:

if(moment().minute()> 30){
    var myTime = moment().minute(30).second(0);
} else {
    var myTime = moment().minute(0).second(0);
}

edited Jan 30 '21 at 19:27

Kaspar Lee

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answered Aug 24 '17 at 14:19

AidaNow

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Although the word `round` was used in question title, OP wants to have something similar to `ceil`. Your solution provides neither, it instead gives an effect of `floor`. – Fr0zenFyr Mar 29 '18 at 05:53

giles · Answer 6 · 2021-04-28T08:25:57.170

For my case, I instead wanted something like

04-28-2021 20:00 => 04-28-2021 20:00
04-28-2021 20:30 => 04-28-2021 20:30
04-28-2021 20:11 => 04-28-2021 20:00
04-28-2021 20:35 => 04-28-2021 20:30

so the function below did the trick

function toNearest30Minutes(date) {
  const start = moment(date)
  let remainder: number
  const elapse = start.minute() % 30
  if (elapse === 0) {
    return moment(date).format()
  } else {
    remainder = 30 - elapse
    return moment(start).add(remainder, "minutes").format()
  }
}

The function above is just an adaptation of @jtromans answer higher above

crg · Answer 7 · 2021-10-20T10:03:29.403

2

One-line solution

 moment().add( moment().minute() > 30 && 1 , 'hours').minutes( moment().minute() <= 30 ? 30 : 0).format("hh:mm a")

Working exemple :

var min = moment().minute()
var dateTime = moment().add(min > 30 && 1 , 'hours').minutes(min <= 30 ? 30 : 0).format("hh:mm a")

console.log(dateTime);

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.20.1/moment.min.js"></script>

edited Oct 20 '21 at 10:03

answered Oct 20 '21 at 09:43

crg

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Josef Held - Satanko · Answer 8 · 2019-10-09T08:47:08.730

even though the question has been answered, I'd like to share my solution too.

var moment = require('moment');

const roundToNearestXXMinutes = (start, roundTo) => {
    let remainder = roundTo - (start.minute()+ start.second()/60) % roundTo;

    remainder = (remainder >  roundTo/2) ? remainder = -roundTo + remainder : remainder;
    const changedDate = moment(start).add(remainder, "minutes" ).seconds(0).format("DD.MM.YYYY HH:mm:ss");    
}

roundToNearestXXMinutes(moment(), 15);

EDIT: Thanks to Ishmael Sibisi for pointing to a flaw in my code! :)

score -1 · Answer 9 · answered Mar 13 '20 at 22:22

the code below rounds up the current time to the nearest 30 minutes and also flawlessly takes care of any trailing seconds

    var moment = require('moment')
    var main = Date.now() //2020-03-13T23:17:34+01:00
    var mainFormat = moment(main)
    var secs = mainFormat.second()
    var justMinutes = mainFormat.subtract(secs, 'seconds')
    var remainder = 30 - (justMinutes.minute() % 30);
    var dateTime = moment(justMinutes).add(remainder, 'minutes')
    var final = dateTime.format()
    console.log(final) 
    //2020-03-13T23:20:00+01:00

Round moment.js object time to nearest 30 minute interval

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