Re: [Quickfix-developers] QuickFix and daylight savings time

[Djalma R. d. S. F. <drs...@gm...>]

Hi Andrew,

QuickFIX uses the gmtime function to calculate the UTC time based on
the local time.

I believe that the OS should always determine whether daylight saving
time is in effect. If your server runs Windows, the msvc run-time will
assume the USA rules for implementing the DST calculation. But, in the
Date/Time properties, the well-known option Automatically adjust clock
for daylight saving time **MUST** be selected.

Because QF internally uses some variables to cache data time values, I
believe that an abrupt change in the server's clock might cause
unpredictable behaviour for the running application. Since there is no
hooking for changes in OS clock to update these variables, I would
prefer to shutdown the application that uses QF before any adjustment
in the machine's clock and then restart it.

Djalma

On 10/25/07, Andrew Culross <And...@tw...> wrote:
> QuickFIX Documentation:
> http://www.quickfixengine.org/quickfix/doc/html/index.html
> QuickFIX Support:
> http://www.quickfixengine.org/services.html
>
>
>
>
> All,
>
> With DST approaching for some of us on Nov 4th, are there any known
> issues/recommendations with QuickFix 1.12.4 ? Given that I have multiple
> sessions specified (the times  are in UTC) with start and stop times I
> wanted to check. Will a running QuickFix engine update it's internal time
> properly if the server's time changes due to DST?
>
>
>
> Andrew Culross
>
> TwoFour Systems
>
> 445 Hamilton Ave
>
> White Plains, NY 10601
>
> Direct   +1 (914) 220-8849
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>
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>
>
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