JSON date converting into time string

Question

Running into a JavaScript date weirdness that I cannot wrap my head around.

I have a date/time returned via WebAPI: '2012-12-13T12:17:06.080'. It's in local time (-7 UTC).

When running this date through JavaScript

var d = new Date('2012-12-14T05:32:05.543');
alert(d.toTimeString());

returns 22:32:05 MST

Then doing

var d = new Date('2012-12-14T05:32:05.543');
alert(d.toLocaleTimeString());

returns 10:32:05 PM

toTimeString/toLocaleTimeString() per JavaScript docs says it should just extract the Time portion, so why did the time change? What should I do to get it to return the correct time portion 05:32:05 without creating an supposedly unneeded function?

Is'nt it obvious? How should new Date know that you already subtracted the seven hours to get local time. It does'nt, so it treats all timestrings the same, and converts them to local time, subracting another seven hours, giving you the wrong time. — adeneo
– adeneo, Commented Dec 14, 2012 at 17:42
Yes, it's VERY obvious, but @Pointy made the point (ahem) that there's assumptions involved. — Rob Koch
– Rob Koch, Commented Dec 14, 2012 at 18:23

Pointy · Accepted Answer · 2012-12-14 17:34:00Z

1

When you give the Date() constructor an ISO8601 timestamp string, it always interprets it as UTC.

Not all browsers behave the same way, and some don't like those at all.

answered Dec 14, 2012 at 17:34

Pointy

415k62 gold badges600 silver badges631 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

closure · Accepted Answer · 2012-12-14 18:22:54Z

1

Here is a way to solve your problem:

Take the parts of the date and construct the date object manually.

I have attached a JSBin showcasing that http://jsbin.com/iduzaz/3/watch

answered Dec 14, 2012 at 18:22

closure

7,4521 gold badge25 silver badges23 bronze badges

Collectives™ on Stack Overflow

JSON date converting into time string

2 Answers 2

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related