CODEWITHSUNDEEP
javascriptjquerymomentjs
Robin Walmsley
Robin Walmsley

Reputation: 95

Javascript/Jquery/Moment.js calculate the number of days between two dates

I've googled loads and read loads, and so far wasted about 3 hours on this. I can't believe its so tough.

I have a Javascript/Jquery app, I have the moment.js plugin installed. I'm writing a POS application, and I need to calculate the difference in days between two dates, so I can warn the user that a particular returned item might be too old to be returned.

I found this code in JS which looks good and seems to be the popular way to do it, although I just couldn't get it to work

var oneDay = 24*60*60*1000; // hours*minutes*seconds*milliseconds
var firstDate = new Date(2008,01,12);
var secondDate = new Date(2008,01,22);

var diffDays = Math.round(Math.abs((firstDate.getTime() -  secondDate.getTime())/(oneDay)));

I also tried this using Moment.js, which again looks really neat

var a = moment([2007, 0, 29]);
var b = moment([2007, 0, 28]);
var x = a.diff(b);

The latter would be my preferred technique. But in my case I get the error "oDate.diff is not a function", here's my code ...

todaysDate = moment(new Date()).format('YYYY, MM, DD');
oDate = moment(result.Order.created).format('YYYY, MM, DD');
var diffDays = oDate.diff(todaysDate, 'days');

I suspect the problem is to do with the format of the oDate variable. But I can't work out why.

EDIT. Incidentally I checked the value of todaysDate and oDate with console.log and they are todaysDate - 2016, 09, 14 oDate - 2016, 09, 12

Any advice? Cheers

Upvotes: 5

Views: 10285

Answers (4)

Ravikiran kalal
Ravikiran kalal

Reputation: 1070

Do no use format function before taking the difference. . .once you call format it wont be moment object anymore. format function converts it into a string.

todaysDate = moment(new Date());
oDate = moment(result.Order.created);
var diffDays = oDate.diff(todaysDate, 'days');

Upvotes: 7

Kamila Korzec
Kamila Korzec

Reputation: 99

You could convert date to unix timestamp (moment.unix()), subtract two timestamps and check duration using moment.duration(), it's similar to your first try

Upvotes: 2

MarcoS
MarcoS

Reputation: 17721

Did you try something like this?

var startDate = new Date(2008, 01, 12);
var endDate = new Date(2008, 01, 22);
var duration = moment.duration(endDate.diff(startDate));
var diffDays = duration.asDays();

Here I use moment.duration() and diff() to get the interval between the two dates duration, and then asDays() to get the result in days...

Upvotes: 2

Sumanta736
Sumanta736

Reputation: 705

You can try this: 

function showDays(firstDate,secondDate){



              var startDay = new Date(firstDate);
              var endDay = new Date(secondDate);
              var millisecondsPerDay = 1000 * 60 * 60 * 24;

              var millisBetween = startDay.getTime() - endDay.getTime();
              var days = millisBetween / millisecondsPerDay;

              // Round down.
              alert( Math.floor(days));

          }

Upvotes: 0

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