JavaScript / Extjs - Calculate number of hours from time stamp

Question

I have this time stamp format for each car in my map:

2012-12-11T03:51:43+03:00

I want to extract the number of hours from it according to current time.

I don't know how to parse this string then compare it to current time.

Any Idea ?

Just to add to Yoshi's answer, you might look at using a library like [MomentJS](http://momentjs.com) for the parsing part, since even IE8 won't parse that string. — T.J. Crowder, Dec 11 '12 at 09:21

score 2 · Answer 1 · answered Dec 11 '12 at 09:03

2

something like:

var
  d1 = new Date('2012-12-11T03:51:43+03:00'),
  d2 = new Date;

console.log(
  (d2 - d1) / 3600000
);

answered Dec 11 '12 at 09:03

Yoshi

54,081
14
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103

@ Yoshi: No, actually, since you're doing the date math, it'll using milliseconds-since-the-epoch and the timezones should fall out. – T.J. Crowder Dec 11 '12 at 09:05
But do beware that not all browsers support parsing that date string. That format was only introduced in ES5 (so, about three years ago) and doesn't work on older browsers. – T.J. Crowder Dec 11 '12 at 09:06
@T.J.Crowder ok, that may be for I did only check chrome. – Yoshi Dec 11 '12 at 09:06
Could be fixed with some regex find/replace. – Salman A Dec 11 '12 at 09:10
@SalmanA: No, you'd be better off properly parsing it. If you do the regex thing, you'll A) be off into unspecified territory, and B) *probably* be working in the local timezone (again, though unspecified). – T.J. Crowder Dec 11 '12 at 09:10
I'm with T.J.Crowder here, if the target platform does not allow parsing the string like this, I would not even try to fix that, and instead go for a completely different solution. – Yoshi Dec 11 '12 at 09:12
@mplungjan: You shouldn't need to do anything to it for Firefox (I don't). IE8, though, will fail, as will earlier versions. – T.J. Crowder Dec 11 '12 at 09:13
I am talking about transforming the string `'2012-12-11T03:51:43+03:00'` into `2012-12-11 03:51:43 GMT+03:00`. Should work? – Salman A Dec 11 '12 at 09:13

score 0 · Answer 2 · edited May 23 '17 at 12:21

You need to first fix the timestamp for other browsers than Chrome

javascript date.parse difference in chrome and other browsers

DEMO

var noOffset = function(s) {
  var day= s.slice(0,-5).split(/\D/).map(function(itm){
    return parseInt(itm, 10) || 0;
  });
  day[1]-= 1;
  day= new Date(Date.UTC.apply(Date, day));  
  var offsetString = s.slice(-5)
  var offset = parseInt(offsetString,10)/100;
  if (offsetString.slice(0,1)=="+") offset*=-1;
  day.setHours(day.getHours()+offset);
  return day.getTime();
}
alert(parseInt((new Date().getTime()-noOffset(yourTimeStamp))/3600000))

JavaScript / Extjs - Calculate number of hours from time stamp

2 Answers2