Get timezone difference between client and server

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If my user is in California and they have their computer set to PST, it's 1:00 pm there. If my server is set to EST, the current server time is 4:00 pm.

I need a way to get the timezone difference between the client and the server, either in Javascript or C#. In my example, I would get 3 (or -3, doesn't matter).

Does anyone know how to do this?

EDIT: Possible solution for RedFilter

Doing it all in javascript:

serverDate = new Date('<%= DateTime.Now.ToString() %>');
clientDate = new Date();
diffMin = (serverDate.getTime()-clientDate.getTime())*1000*60;  //get difference in minutes

Think that would work? Or would both of those return the same time?

You could:

1 - Return the server date to the client as a Javascript date variable. 2 - Create a new javascript date client side (var currentTime = new Date();) and subtract the above date 3 - Post the result back to the server (if necessary; you may only need to know the difference client-side).

Update

Here is an example:

serverDate = new Date('<%= DateTime.Now.ToString() %>'); 
clientDate = new Date(); 
diffMin = (serverDate.getTime()-clientDate.getTime())/(1000*60);
alert("serverDate: " + serverDate + "\r\n" + "clientDate: " + clientDate + "\r\n" +
  "diffMin: " + diffMin);

If the server and client are on the same machine, you will see a diffMin approaching zero. There is a slight difference between the dates due to the time between the server-side script generating the date and the browser parsing and executing the javascript.

//This was useful for me - DateTime.Now.ToString("yyyy-MM-ddTHH:mm:ss")

c# - Get timezone difference between client and server, If my server is set to EST, the current server time is 4:00 pm. I need a way to get the timezone difference between the client and the server, either in Javascript or � Get timezone difference between client and server If my user is in California and they have their computer set to PST, it's 1:00 pm there. If my server is set to EST, the current server time is 4:00 pm.

Do you need to know the timezone of the location or the machine?

If you need to know the timezone of the location then your best bet is to subscribe to a Geo-IP service, and check the IP, then checking on the timezone for that location (there are publicly available databases for that). It's not guaranteed as IP geographic information is not guaranteed (and that's definitely not just a theoretical lack of guarantee, mis-information abounds).

Often though, what you really want is the client machine's timezone setting. For most services I would find it annoying if I was travelling and had a website think of me to be in a different time to that I was working in (I stick to my home timezone if I'm not out of it for long).

This is easily done client side. new Date().getTimezoneOffset() returns the number of minutes between UTC and local time. E.g. currently I'm in Irish Summer Time (GMT + 1hour daylight saving time), and it returns -60.

You can easily put that in a URI used by an image or XHR request, or put it in a cookie value.

Timezone diff between server and client?, Webpage Posts a timestamp to the php on the server (using get date function) and php should take the timestamp and give difference between� I am getting one issue with my client server web based application. I have developed a portal using Django framework. my server is situated on AWS (north Virginia). it is one type of time alert application. my issue is when I set time from UI side from india, it is getting stored as per indian time.

This problem has been plaguing me: I'm having a similar issue but I'm doing it server-side and running a node.js AWS Lambda. I cannot accept that I need to pass the time from the client to the server (or visa-versa should that be your case). I know the timezone, javascript knows the rules for converting them, why should I need to pass it back and forth? What I did just calculates the difference between the two timezones for whatever the date is. Below, it is set up to convert between UTC and timezones in the US, which never have partial hours so I have it set to round to an integer of hours, but you'll need to re-work this if you're ever working with wonky timezones like India, etc. You need to round because there are extra milliseconds leftover (which I suspect has to do with the decay rate of Cesium and not a rounding error--not sure don't care).

Note that this is running server-side (but the reverse will obviously work) and that my server runs UTC. Also note that when you initialize the first date variable, you need to set the date to the date you want the offset for because they can change day-to-day.

var UTCTime = new Date();
var pacificTime = new Date(UTCTime.toLocaleString("en-US",{timeZone: "America/Los_Angeles"}));
var offset = Math.round((UTCTime-pacificTime)/1000/60/60,0);
console.log(offset); // returns 7 (during daylight saving time)

Hope this helps someone...

Java Server Vs Client Time Zone Difference Problem, Note : IST is 5:30 hours ahead of GMT. For this you have to write some code more specifically javascript that will get executed (on page load)� Important Note : You can’t set this value in session because session is a server side property and it is not accessible from client code. Server Side : On the server side you don’t have to do much , just make sure that after fetching the data (Time and Date) from the server in UTC format , convert it back according to the user timezone with the help of value that you received in cookie.

One good way to check for timezone difference, is to know the timezone (location) where the time is taken. If you can obtain that on the client side and the server side you can check the TimeZoneInfo class (needs 3.5 I think) TimeZoneInfo from Koders.

Convert the client and server time with the associated zone to UTC (ConvertTimeZoneToUtc) and compare the two.

Date.prototype.getTimezoneOffset(), The getTimezoneOffset() method returns the time zone difference, in minutes, Get current timezone offset for host device let x = new Date();� The time is not in sync with the Client workstation and the Global Catalog Server. SOLUTION To resolve this issue, log on to your computer locally using an account with administrative privileges, and set the time and date to match the time and date on the Global Catalog Server. Below is list of steps that can be used to synchronize the time:

Overview | Time Zone API, This service is also available in the Java Client, Python Client, Go Client and Node.js The API returns the name of that time zone, the time offset from UTC, and the Note that different browsers, proxies, and servers may have different URL Get more information on authentication parameters for Premium Plan customers. CURRENT_TIMEZONE is a non-deterministic function. Views and expressions that reference this column cannot be indexed. Example. Note that the value returned will reflect the actual time zone and language settings of the server or the instance. SELECT CURRENT_TIMEZONE(); /* Returned: (UTC+01:00) Amsterdam, Berlin, Bern, Rome, Stockholm, Vienna */

Datetime Data Types and Time Zone Support, Clients and Servers Operating with Different Versions of Time Zone Files The time zone offset is the difference (in hours and minutes) between local time and For example, you can use them to calculate a moving average of stock prices. One good way to check for timezone difference, is to know the timezone (location) where the time is taken. If you can obtain that on the client side and the server side you can check the TimeZoneInfo class (needs 3.5 I think) TimeZoneInfo from Koders.

JavaScript getTimezoneOffset() Method, The getTimezoneOffset() method returns the time difference between UTC time and local time, in minutes. For example, If your time zone is GMT+2, -120 will be� Arguments. inputdate Is an expression that can be resolved to a smalldatetime, datetime, datetime2, or datetimeoffset value.. timezone Name of the destination time zone. SQL Server relies on time zones that are stored in the Windows Registry.

Comments
  • If the server is set to EST, something is wrong. It should run in UTC. That will remove so many headaches related to time zones.
  • @Frederik I don't see how that really changes things. If the application needs to know the time offset of the client, it needs to know regardless of the server timezone setting.
  • My server is actually running in UTC, I just used EST as an example to avoid all the "there are functions to convert dates to UTC" answers, which wouldn't help with the problem I'm having.
  • I'd advocate storing data (when in data structures or database) as UTC times, but setting the entire server to UTC is a little much.
  • Also, keep in mind that 1) there are timezones with half-hour UTC offsets 2) The difference in time between two timezones changes throughout the year.
  • I edited my original, let me know if you think that would work.
  • That's the problem, I don't know the timezone that the client will be navigating from, it could be from anywhere. If I could get that info somehow, that would be helpful, but I don't know how.
  • Then I would like to know how you obtain the time from the client. Cause I have a similar problem and I resolved it by using the location of all the contacts. I use cities location associated with a timezone.