JavaScript: Date Object Bug in Specific Time Zone

Question

I have a program that uses the Date object in JavaScript. I've noticed that the program is not working properly in all time zones (countries).

So I've changed my Windows time zone and I got strange results in specific dates.

With these lines of codes I have same results in many Time Zones but one of them (maybe some):

console.log( new Date( 2005, 2, 20 ) ); // 2005 Mar 20
console.log( new Date( 2006, 2, 20 ) ); // 2006 Mar 20

Time Zone: UTC 00:00 (Correct) enter image description here

Time Zone: Pacific (US & Canada) -08:00 (Correct) enter image description here

Time Zone: Newfoundland -03:30 (Correct) enter image description here

Time Zone: China +08:00 (Correct) enter image description here

Time Zone: Iran +03:30 (Incorrect!) enter image description here

(Notice the 19 Mar and 23:00:00 and Daylight vs. Standard)
(I've tested the problem in Chrome with the same result)

I've solved the problem with this solution:

new Date( Date.UTC(2005, 2, 20) );

But I want to know what happens here?
Is +03:30 has any bugs? What is the difference between Daylight and Standard?

That's weird...

You are familiar with Daylight Savings Time (DST) right? It looks like DST happens in the night of March 19th in Iran. — Halcyon
– Halcyon, Commented Feb 8, 2013 at 12:10
They changed how DST is observed in 2006. en.wikipedia.org/wiki/Daylight_saving_time_in_Iran — Halcyon
– Halcyon, Commented Feb 8, 2013 at 12:14

Jehanzeb.Malik · Accepted Answer · 2013-02-08 12:17:09Z

1

There is no problem with date object. Some countries observe daylight savings during spring and autumn season to get more daylight time. Check Here. It just so happened that on 20 March 2005 Iran's time was subject to daylight savings. Showing you correctly what time they were observing (Notice that the difference with GMT changed from +0430 to +0330). Where as on that day in year 2006 they were following the regular time and not subject to daylight savings.

Refer to "Frits van Campen" link in the comments.

answered Feb 8, 2013 at 12:17

Jehanzeb.Malik

3,3904 gold badges29 silver badges42 bronze badges

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

1 Comment

Jehanzeb.Malik Over a year ago

Yes that will work perfect. It is legally and technically correct date and time that you are getting.

Aran Tamool · Accepted Answer · 2020-07-30 05:54:27Z

0

You should unify the time zone for or make the timeZone appearing as the customer time zome. For Example for Australia, I use below for AU Sydney time Zone

let expirationTime = new Date().toLocaleString("en-US", {timeZone: "Australia/Sydney"});
expirationTime = new Date(expirationTime);

I hope that helps ☺

answered Jul 30, 2020 at 5:54

Aran Tamool

3494 silver badges7 bronze badges

Collectives™ on Stack Overflow

JavaScript: Date Object Bug in Specific Time Zone

2 Answers 2

1 Comment

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

Comments

Your Answer

Sign up or log in

Post as a guest

Related