How to convert datetime from the users timezone to EST in javascript [duplicate]

Question

I have a web application that has a dynamic javascript calendar, which allows users to set events for a given data and time. I need to push notifications to the users, so I need to convert the date time and timezone they entered, into Eastern Standard Time, so that my notifications are sent out at the correct time.

I would like to do this in javascript, so that when the data time value gets to the php, it's in the right format, before being added to the database.

So to summarize, I need to convert a javascript datatime and timezone, which I get by capturing the users datatime, as a full UTC date, to my servers timezone, which is EST - New York.

Any help or direction on this matter, would be greatly appreciated. Thanks :)

user47900 · Accepted Answer · 2012-01-30 21:03:00Z

24

Pl check this script

function convertToServerTimeZone(){

    //EST
    offset = -5.0

    clientDate = new Date();
    utc = clientDate.getTime() + (clientDate.getTimezoneOffset() * 60000);

    serverDate = new Date(utc + (3600000*offset));

    alert (serverDate.toLocaleString());


}

answered Jan 30, 2012 at 21:03

user47900

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5 Comments

Carl Weis Over a year ago

This works! How can I convert the time back to the users timezone, for displaying the datetime on the page?

user47900 Over a year ago

It's all in the offset. You can use user timezone offset and use functions available on date object to render in user locale specific format.

user47900 Over a year ago

It's much more simple if you intend to do using Javascript. As this runs on client browser , all that you need is code like below . 'function displayClientTimeZone(){ clientDate = new Date(); alert (clientDate.toLocaleString()); return clientDate.toLocaleString(); }'

Matt Johnson-Pint Over a year ago

Be aware that while this solution converts to EST (North American EST, that is). It does not account for daylight saving time. So if you're looking for EST, this is fine. If you're looking for "US Eastern Time", composed of both Eastern Standard Time and Eastern Daylight Time, this approach will not work. You will need a library to do that.

Monkey D. Luffy Over a year ago

Great work man!! Using your solution with little bit of trick setInterval({ convertToServerTimeZone() },1000) I was able to trigger realtime Multi-timezone clock

Yevgeny Simkin · Accepted Answer · 2012-01-30 21:12:05Z

0

I would draw the EST timezone offset into the page while you're rendering it (via PHP) and then grab the UTC time on the client and offset it by the amount you've drawn in. Otherwise, if your server ever moves timezones your page will suddenly be reporting the wrong time.

I just did this recently though, and found that the simplest way to handle this is to actually use mySQL (I'm assuming that's your DB), and just let IT convert the timezone for you while you're entering the date stamp. Unless you're worried this is too tasking and you're trying to absolutely reduce the work your db is doing, I'd go that route, rather than muck about trying to do manual TZ conversions in JS.

answered Jan 30, 2012 at 21:12

Yevgeny Simkin

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