Prestwood IT: Get GMT Server Offset (ASP Classic Coding)

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► KB ► Website Scri... ► ASP Classic ► Language Basics

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From the June 2013 Issue of Prestwood eMag

ASP Classic Language Basics:

Get GMT Server Offset

By Mike Prestwood

Posted 17 years ago on 5/7/2007

Take Away: You can use JavaScript to set an IIS App var to the GMT server difference. Then use that number in your code.

KB100536

Here is a technique to get the current GMT offset and use it from ASP. In JavaScript, the getTimezoneOffset function returns the number of minutes offset to GMT and you can use it to set an application variable that you use with ASP.

1. Create an ASP file called SetGMTOffSetApp.asp with the following contents.

<%@ LANGUAGE=JScript %>
<%
  var x = new Date()
  Application("ServerGMTOffset") = 0 - new Date().getTimezoneOffset();

%>

The "0 - " is because in getTimezoneOffset the sign of the offset is reversed. -3 hours GMT is actually returned as 3 by the function, and +8 is returned as -8.

2. In your Global ASA OnStart code, or whever you like, you can do the following:

If Application("ServerGMTOffset") = "" Then Server.Execute "SetGMTOffSetApp.asp"

So when you apply the offset in your code, remember to use the "n" option (for minutes) in the DateAdd function.
eg: GMTNow = DateAdd("n", Application("ServerGMTOffset"), Now)


Comments 1 Comments. Share a thought or comment...

Mike Prestwood

Comment 1 of 3

If you're using SQL server, you can also use GETUTCDATE() function SQL gets it from the server's own region settings, like the UTCTime functions does in ASP.NET, so it takes into account daylight savings etc. Remember, good coding means ALL your dates should be stored in UTC time. This is the way to get it.

The SQL code would be:

"SELECT GETUTCDATE() AS MyUTCDate"

It's worth doing this in your app's OnStart code (in global.asa).

If Application("ServerUTCDate") = "" Then
... get it from SQL
End If

Posted 17 years ago

PS_2574

Comment 2 of 3

I am so happy to read this. This is the kind of manual that needs to be given and not the random misinformation that’s at the other blogs.

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Posted 56 months ago

PS_2754

Comment 3 of 3

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Posted 54 months ago

KB Post Contributed By Mike Prestwood:

Mike Prestwood is a drummer, an author, and creator of the PrestwoodBoards online community. He is the President & CEO of Prestwood IT Solutions. Prestwood IT provides Coding, Website, and Computer Tech services. Mike has authored 6 computer books and over 1,200 articles. As a drummer, he maintains play-drums.com and has authored 3 drum books. If you have a project you wish to discuss with Mike, you can send him a private message through his PrestwoodBoards home page or call him 9AM to 4PM PST at 916-726-5675 x205.

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