Solved

VB.NET - Times based on Daylight Savings

Posted on 2006-11-01
8
366 Views
Last Modified: 2012-06-27
I have written an VB.NET .ashx page that displays the time for Melbourne (VIC), Irvine (California), and Toronto (Canada), but I need to take into account the daylight savings time periods for those cities and adjust the time accordingly, but can't get my head around the code that is needed.

Does anyone have any suggestions on how I should do this?

I'm using the command "DateTime.UtcNow" to get the GMT time.

Thanks!
0
Comment
Question by:CDFx
8 Comments
 
LVL 14

Expert Comment

by:Ramuncikas
ID: 17856331
0
 

Author Comment

by:CDFx
ID: 17856378
Thanks Ramuncikas, but I don't think they'll help me in this situation.
0
 
LVL 15

Expert Comment

by:OMC2000
ID: 17856435
The only problem here is that Daylight Savings Time starts and stops at different dates.

check answer based on the database table at
http://www.experts-exchange.com/Web/Web_Languages/PHP/Q_20103151.htm

or just use general approach, add subtract difference in hours from your time.
Change number of hours depending on current date.
Make functions:
f1, which calculates difference between your time and GMT, you will always get correct difference for your time zone based on OS functionality.
f2, which calculates difference between desired time zone and GMT,
it must take daylignt saving into consideration. If current date is within daylight savings period, function returns 2, otherwise 1.

sum of the results of these two functions is number of hours, which you should subtract from you current time.
0
Free Tool: Port Scanner

Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

 
LVL 15

Expert Comment

by:OMC2000
ID: 17872435
It becomes popular to declare that "I solved problem by myself", after the answer, which describes the working solution, was posted.

Well, close it and refund. It's just a reason to check questioner's history first.
0
 

Author Comment

by:CDFx
ID: 17872568
Your so-called "working solution" had nothing to do with me solving the problem.  I actually found the solution myself using some code from this site: http://www.michaelbrumm.com/simpletimezone.html
0
 
LVL 15

Expert Comment

by:OMC2000
ID: 17879221
Ok, fine, "close it and refund" points.
0
 
LVL 1

Accepted Solution

by:
kodiakbear earned 0 total points
ID: 17894469
Closed, 500 points refunded.
kb
Experts Exchange Moderator
0

Featured Post

Free Tool: Postgres Monitoring System

A PHP and Perl based system to collect and display usage statistics from PostgreSQL databases.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Lots of people ask this question on how to extend the “MembershipProvider” to make use of custom authentication like using existing database or make use of some other way of authentication. Many blogs show you how to extend the membership provider c…
Sometimes in DotNetNuke module development you want to swap controls within the same module definition.  In doing this DNN (somewhat annoyingly) swaps the Skin and Container definitions to the default admin selections.  To get around this you need t…
Nobody understands Phishing better than an anti-spam company. That’s why we are providing Phishing Awareness Training to our customers. According to a report by Verizon, only 3% of targeted users report malicious emails to management. With compan…
With Secure Portal Encryption, the recipient is sent a link to their email address directing them to the email laundry delivery page. From there, the recipient will be required to enter a user name and password to enter the page. Once the recipient …

860 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question