# Moment js date time comparison

## Moment js date time comparison

I’m using moment.js to format my date time, here I have two date values, and I want to achieve a particular function when one date is greater than the other. I read most of their docs, but didn’t find the function to achieve this. I know it will be there.
This is my code:
var date_time = 2013-03-24 + ‘T’ + 10:15:20:12 + ‘Z’
var d = moment(date_time).tz(‘UTC’); // first date

var now = new Date(),
dnow = moment(now).tz(‘UTC’),
snow = dnow.minute() % 15,
diffnow = 15 – snow,

// allow input time
console.log(‘UTC TIME DB’, d.format());
} else {

}

Edit
var date_time = req.body.date + ‘T’ + req.body.time + req.body.timezone; // 2014-03-24T01:15:000
var utc_input_time = moment(date_time).utc(); // 2014-03-24T01:15:000
console.log(‘utc converted date_time’, moment(date_time).utc().format(“YYYY-MM-DDTHH:mm:SSS”));
var isafter = moment(utc_input_time).isAfter(moment(‘2014-03-24T01:14:000’)); // true
if(isafter === true){
console.log(‘is after true’);
} else {
console.log(‘is after is false’);
}

Here, I am comparing two dates i.e. 2014-03-24T01:15:000 > 2014-03-24T01:14:000, expecting that the first one is greater than the second one, but it always goes to the else condition. I don’t know why?

### Solution 1:

I believe you are looking for the query functions, `isBefore`, `isSame`, and `isAfter`.

But it’s a bit difficult to tell exactly what you’re attempting. Perhaps you are just looking to get the difference between the input time and the current time? If so, consider the difference function, `diff`. For example:

``````moment().diff(date_time, 'minutes')
``````

A few other things:

• There’s an error in the first line:

``````var date_time = 2013-03-24 + 'T' + 10:15:20:12 + 'Z'
``````

That’s not going to work. I think you meant:

``````var date_time = '2013-03-24' + 'T' + '10:15:20:12' + 'Z';
``````

Of course, you might as well:

``````var date_time = '2013-03-24T10:15:20:12Z';
``````
• You’re using: `.tz('UTC')` incorrectly. `.tz` belongs to moment-timezone. You don’t need to use that unless you’re working with other time zones, like `America/Los_Angeles`.

If you want to parse a value as UTC, then use:

``````moment.utc(theStringToParse)
``````

Or, if you want to parse a local value and convert it to UTC, then use:

``````moment(theStringToParse).utc()
``````

Or perhaps you don’t need it at all. Just because the input value is in UTC, doesn’t mean you have to work in UTC throughout your function.

• You seem to be getting the “now” instance by `moment(new Date())`. You can instead just use `moment()`.

### Updated

Based on your edit, I think you can just do this:

``````var date_time = req.body.date + 'T' + req.body.time + 'Z';
var isafter = moment(date_time).isAfter('2014-03-24T01:14:00Z');
``````

Or, if you would like to ensure that your fields are validated to be in the correct format:

``````var m = moment.utc(req.body.date + ' ' + req.body.time, "YYYY-MM-DD  HH:mm:ss");
var isvalid = m.isValid();
var isafter = m.isAfter('2014-03-24T01:14:00Z');
``````

### Solution 2:

You should be able to compare them directly.

``````var date = moment("2013-03-24")
var now = moment();

if (now > date) {
// date is past
} else {
// date is future
}
``````
``````\$(document).ready(function() {

\$('.compare').click(function(e) {

var date = \$('#date').val();

var now = moment();
var then = moment(date);

if (now > then) {
\$('.result').text('Date is past');
} else {
\$('.result').text('Date is future');
}

});

});``````
``````<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.10.3/moment.min.js"></script>

<input type="text" name="date" id="date" value="2014-12-18"  placeholder="yyyy-mm-dd">
<button class="compare">Compare date to current date</button>
<br>
<div class="result"></div>``````

### Solution 3:

Jsfiddle: http://jsfiddle.net/guhokemk/1/

`````` function compare(dateTimeA, dateTimeB) {
var momentA = moment(dateTimeA,"DD/MM/YYYY");
var momentB = moment(dateTimeB,"DD/MM/YYYY");
if (momentA > momentB) return 1;
else if (momentA < momentB) return -1;
else return 0;
}

``````

The method returns 1 if dateTimeA is greater than dateTimeB

The method returns 0 if dateTimeA equals dateTimeB

The method returns -1 if dateTimeA is less than dateTimeB

### Solution 4:

pass date to moment like this it will compare and give result.
if you dont want format remove it

``````moment(Date1).format("YYYY-MM-DD") > moment(Date2).format("YYYY-MM-DD")
``````

### Solution 5:

It is important that your datetime is in the correct ISO format when using any of the momentjs queries: `isBefore`, `isAfter`, `isSameOrBefore`, `isSameOrAfter`, `isBetween`

2014-03-24T01:14:00 or 2014-03-24T01:14:00.000Z

otherwise you may receive the following deprecation warning and the condition will evaluate to false:

Deprecation warning: value provided is not in a recognized RFC2822 or
ISO format. moment construction falls back to js Date(), which is not
reliable across all browsers and versions. Non RFC2822/ISO date
formats are discouraged and will be removed in an upcoming major

``````// https://momentjs.com/docs/#/query/

const dateIsAfter = moment('2014-03-24T01:15:00.000Z').isAfter(moment('2014-03-24T01:14:00.000Z'));

const dateIsSame = moment('2014-03-24T01:15:00.000Z').isSame(moment('2014-03-24T01:14:00.000Z'));

const dateIsBefore = moment('2014-03-24T01:15:00.000Z').isBefore(moment('2014-03-24T01:14:00.000Z'));

console.log(`Date is After: \${dateIsAfter}`);
console.log(`Date is Same: \${dateIsSame}`);
console.log(`Date is Before: \${dateIsBefore}`);``````
``````<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.22.0/moment.min.js"
></script>``````

### Solution 6:

I have to do this in my case, when user opens a quotation from transaction history if the quotation start date is less than current date I needed to show the current date as start date.

``````var startDate = "20/05/2018";

var date1 = moment().format("YYYY-MM-DD");
var date2 = moment(startDate).format("YYYY-MM-DD");

// and i checked with if statement

if(date1 >  date2){   // if startDate is less than today
startDate = date1;
}else{ // if startDate is greater than today

}
``````

NOTE : for me it needed to convert both dates into same format and I used “YYYY-MM-DD”.