CODEWITHSUNDEEP
javascriptmomentjs
stanleyxu2005
stanleyxu2005

Reputation: 8241

Calculate number of days with momentjs goes wrong

I want to calculate the days between two date objects. I found some wired result, so I test simply by subtracting the current date with itself, the result is expected to be 0, but it returns 4, which I cannot explain.

I use momentjs for quite a long time. I trusted the library and its results. What's wrong with the code?

var now = new Date();
var diff = moment(now - now).days();
console.log(diff);
console.log(now - now);
<script src="http://momentjs.com/downloads/moment.min.js"></script>

Update #1: Really sorry for this silly question. The correct format should be

var diff = moment.duration(now - now).days();

Upvotes: 1

Views: 356

Answers (2)

haim770
haim770

Reputation: 49095

Since now - now returns 0, you code is equivalent to:

moment(0) // "Thu Jan 01 1970 02:00:00 GMT+0200"
      .days() // 4 is for Thursday

You better use moment.diff() to get the difference between two dates:

var d1 = new Date(),
    d2 = new Date();

var differenceInDays = moment(d1).diff(d2, 'days'); // 0, obviously

See Documentation

Upvotes: 3

Farkhat Mikhalko
Farkhat Mikhalko

Reputation: 3645

It is the 4 day of week

new Date(0) => Thu Jan 01 1970 06:00:00 GMT+0600 // my local timezone

Upvotes: 2

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