javascriptdatemomentjstimeago

Moment js Time Ago calculate wrong date

maybe a simple question but i don't get it.

var date = new Date();
test = date.toISOString();
alert(moment(test, "YYYYMMDD").fromNow());

Will return "16 hours", but why?

Demo: https://jsfiddle.net/5jacaxbf/

Solution

  • Because you are using moment(String, String), instead of moment(String) (toISOString() output is obviously in ISO 8601 format) or moment(Date).

    So moment(test, "YYYYMMDD") will be the start of the day instead of the current time.

    As the Default section states:

    You can create a moment object specifying only some of the units, and the rest will be defaulted to the current day, month or year, or 0 for hours, minutes, seconds and milliseconds.

    var date = new Date();
test = date.toISOString();
var m1 = moment(test, "YYYYMMDD")
console.log(m1.format());
console.log(m1.fromNow());
var m2 = moment(test)
console.log(m2.format());
console.log(m2.fromNow());
var m3 = moment(date)
console.log(m3.format());
console.log(m3.fromNow());
    <script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.20.1/moment.min.js"></script>