Re: Finding the offset of a specific time zone

It sounds like you're suggesting the client send the date/time stamp to include the TT data, since it's the only one that knows that when it sends the date/time data.  But why?  If you're changing client code to send different data, just convert from local time to UTC and send it.  It's the only reliable way to store date/time data than can be converted to any other local time without having to know the originating timezone.

Having a config file of daylight time observances is simply too complicated.  You can't simply take into account current observances of daylight savings time.  You have to take into account the observances at the date and time of the date/time value.  E.g. the observance in the US changed in 2007 to the 2nd Monday in March from the first Sunday in April.  How do you convert both of the following UTC times correctly: 13-Mar-2006 10AM,  13-Mar-2007 10AM?  You'd have to have a config file containing all the changes to US daylight savings time observances, look up that one that applies to a particular date/time value, and use it for the conversion.  Do you really want to manage that data while the OS on both ends is already doing that?

-- Peter

On Wed, 25 Mar 2009 14:18:56 -0400, John Warner <[email protected]> wrote:

>http://tf.nist.gov/service/its.htm
>
>See if this helps. Read through the entire page and note the TT portion of
>the data and explanation. It appears to have an answer for you as regards
>the US in general observing daylight or standard time. If some counties on
>the left coast ever decide to go it alone you will once again have an
>issue.
>
>I would be inclined to have a config/dat file that the user can update
>when daylight time is observed.  Provide a small util to adjust the time
>or just a plain text file that can be edited with notepad. Some sort of
>true false thing would be my thought. Congress every few years likes to
>play with this. Shows they are important, so you would need to make some
>provision for the US political system...

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