Daylight Savings Time Change

pts.
Tags:
AS/400
Database
Does anyone know how the daylight savings time change works on the AS400 in V5R3? I changed the required system values, etc and the time changed on our system just fine...but I thought the time was supposed to gradually speed up/slow down (depending on the time change) until the desired time was reached. Everything I read on the subject said that is how it was going to work in V5R3 but when I look in the log that doesn't appear to be what happened.

Answer Wiki

Thanks. We'll let you know when a new response is added.

The speed-up and slow-down clock process is a hardware function. It works that way only on i5 hardware (model 520 570 etc.) If you have V5R3 on a 170 or 720 or even an 8xx box it will just SLAM it back)

==========================================================

It doesn’t matter what hardware or model is involved; the result is the same in all systems if the time zone support is used. Further, it works exactly as it should work — immediately jumping forward or backward one hour. This is what happens to the time. The hour repeats in the fall and skips in the spring. It most definitely <b>should not</b> simply speed up or slow down.

Because the time is set according to government standard, any attempt to sneak past it is essentially the creation of fraudulent timestamps. Audit requirements (with possible legal ramifications) demand that the times be set properly. If applications are not written to account for something that’s happened every year for the past 40 years in most of the nation, the developers need to be replaced.

Two specific methods of handling it are to suspend processing of transactions for one hour at 2:00 AM in the fall upon reaching the end of Daylight Saving Time or to record all times as UTC and only convert to/from local time in the presentation layer.

Tom

Discuss This Question: 2  Replies

 
There was an error processing your information. Please try again later.
Thanks. We'll let you know when a new response is added.
Send me notifications when members answer or reply to this question.

REGISTER or login:

Forgot Password?
By submitting you agree to receive email from TechTarget and its partners. If you reside outside of the United States, you consent to having your personal data transferred to and processed in the United States. Privacy

Forgot Password

No problem! Submit your e-mail address below. We'll send you an e-mail containing your password.

Your password has been sent to:

To follow this tag...

There was an error processing your information. Please try again later.

REGISTER or login:

Forgot Password?
By submitting you agree to receive email from TechTarget and its partners. If you reside outside of the United States, you consent to having your personal data transferred to and processed in the United States. Privacy

Thanks! We'll email you when relevant content is added and updated.

Following