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Thread #547

bernie has no photo

by: bernie
April 14th, 2006
The Daylight Savings Time Issue in Calculations
Well, since the Daylight Savings Time Issue is clearly out there let me outline a very related problem that we had a few weeks back that may help in debugging this.

The United States had just switched to Daylight Savings Time.  We were in the process of setting up a conference call so as we usually do we used the "Time Calculator" to determine what time it was here when it was 5:30PM in Paris.  So we set the date AND time for the Monday call and got an answer like 10:30AM.  Which was the time used a few months back.

Upon talking with our folks over there they mentioned that the time would be 9:30AM our time since "Paris does not go on Daylight Savings until the following week."

I did not believe it so I added the time zone to my Outlook calendar and sure enough the time World Time is reporting on that day did NOT take into account the proper change due to Daylight Savings happening here but not there.  

At that time we took this to mean that the "Time Calculator" does not check for changes in Daylight Savings Time based on the calculated date.

Which a) We never noticed that before.  b) So why put in the date if the tool basically ignores it and used the rule for the current time.

However, now it looks like this failure of Daylight Savings Time might be the center of this little problem.

Hope this information helps localize a cure for the problem.  When you are depending on these calculations (which are complex thatīs why we use the tool!) we donīt do a check thought other sources.  Hey, whatever my calculator tells me I donīt manually check the numbers!

Anyhow, thanks in advance for the help getting to the bottom of this issue.

Bernie



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