round up/ round down a momentjs moment to nearest minute

Question

How do you round up/ round down a momentjs moment to nearest minute?

I have checked the docs, but there doesn\'t appear to be a method for this.

Note that I

Answer 1

To round up, you need to add a minute and then round it down. To round down, just use the startOf method.

Note the use of a ternary operator to check if the time should be rounded (for instance, 13:00:00 on the dot doesn't need to be rounded).

Round up/down to the nearest minute

var m = moment('2017-02-17 12:01:01');
var roundDown = m.startOf('minute');
console.log(roundDown.toString()); // outputs Tue Feb 17 2017 12:01:00 GMT+0000

var m = moment('2017-02-17 12:01:01');
var roundUp = m.second() || m.millisecond() ? m.add(1, 'minute').startOf('minute') : m.startOf('minute');
console.log(roundUp.toString());  // outputs Tue Feb 17 2017 12:02:00 GMT+0000

Round up/down to the nearest hour

var m = moment('2017-02-17 12:59:59');
var roundDown = m.startOf('hour');
console.log(roundDown.toString()); // outputs Tue Feb 17 2017 12:00:00 GMT+0000

var m = moment('2017-02-17 12:59:59');
var roundUp = m.minute() || m.second() || m.millisecond() ? m.add(1, 'hour').startOf('hour') : m.startOf('hour');
console.log(roundUp.toString());  // outputs Tue Feb 17 2017 13:00:00 GMT+0000

Answer 2

The roundTo feature could make it into a future release.

Examples:

moment().roundTo('minute', 15); // output: 12:45
moment().roundTo('minute', 15, 'down'); // output: 12:30

Answer 3

Partial answer:

To round down to nearest moment minute:

var m = moment();
m.startOf('minute');

However, the equivalent for rounding up, endOf, doesn't quite give the expected result.

Answer 4

This solution worked for me;

function round_up_to_nearest_hour(date = new Date()) {
   return moment(date).add(59, 'minutes').startOf('hour').toDate();
}

Answer 5

Rounding to the nearest hour can be achieved by adding half an hour and then run .startOf('hour'). This is the same for any time measurement.

var now = moment();
// -> Wed Sep 30 2015 11:01:00
now.add(30, 'minutes').startOf('hour'); // -> Wed Sep 30 2015 11:31:00
// -> Wed Sep 30 2015 11:00:00

var now = moment();
// -> Wed Sep 30 2015 11:31:00
now.add(30, 'minutes').startOf('hour'); // -> Wed Sep 30 2015 12:01:00
// -> Wed Sep 30 2015 12:00:00

Answer 6

Just another possibility:

var now = moment();
// -> Wed Sep 30 2015 11:57:20 GMT+0200 (CEST)
now.add(1, 'm').startOf('minute');
// -> Wed Sep 30 2015 11:58:00 GMT+0200 (CEST)