Js 对象时间到最接近的30分钟间隔

我试着把 Moment.js 时间对象转到下一个最接近的30分钟间隔。但看来我的逻辑错了。

例如:

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

这是我目前的代码

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

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.

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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.

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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");
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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);
}
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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! :)

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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
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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});
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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

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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>


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