Re: [boost] boost and 2007 US DST change

From: Jeff Garland (jeff_at_[hidden])
Date: 2007-01-10 10:19:57

Graham Bennett wrote:
> Hi,
> 
> I'm trying to evaluate whether some applications which use Boost are
> exposed to problems with the change to the start and end dates of
> Daylight Saving Time in the US this year
> (http://en.wikipedia.org/wiki/Energy_Policy_Act_of_2005#Change_to_daylight_saving_time).
> 
>>From an initial inspection, it seems there are at least two areas which
> may cause incorrect behaviour after the change is made:
> 
>  - There is a deprecated template class boost::date_time::us_dst_rules
>    (http://www.boost.org/boost/date_time/dst_rules.hpp) which hard-codes
> the rules for US DST changes.  Admittedly this class is deprecated, but
> it remains in the code base.

True -- it should be updated as I know there are some users.

>  - Boost ships with a database of timezone and DST information in CSV
>    format.  This appears to contain the old dates for the DST changeover
> as reported here
> http://sourceforge.net/tracker/index.php?func=detail&aid=1478619&group_id=7586&atid=207586.
> 
> Does the above seem right?  Also, have these problems been fixed in the
> upcoming 1.34 release?  From a quick scan of CVS it seems not.

Nope, see other recent post on this topic.

> I'd also be grateful if people could comment on any other areas within
> Boost that could be problematic, if any.
> 
> Lastly I wonder if it's worth perhaps summarising this on the Boost site
> somewhere so that it's easier for others to find the information.

It should probably go in the date-time docs and the 1.34 release notes -- care 
to write a summary blurb?

Jeff