Re: [boost] [date_time] Time zone improvements

Subject: Re: [boost] [date_time] Time zone improvements
From: Stewart, Robert (Robert.Stewart_at_[hidden])
Date: 2011-04-25 07:59:20

Artyom wrote:
>
> > >> As the primary maintainer of Boost date-time I can  say
> > >> with certainty that there is interest in this
> > >> functionality -- it's long been on my todo list and I
> > >> haven't had  time to get to it.  You can email me
> > >> privately and we can  discuss all the details of how to
> > >> get your code incorporated.
> >
> > Apologies for digging up the past, but did this lead to
> > anything?  Did time_zone_base prove to be an adequate
> > abstraction in this case?
>
> From the last look I had took on tz support in
> Boost.DateTime (a few weeks ago)
>
> It is completely broken.
>
> I mean the base class seems to be technically fine but the
> actually timezone database in Boost.DateTime is broken.
>
> The time zone rules it uses are too simplified and don't
> cover real use cases where for example DST is changed by
> more complex rules then "First Saturday of May" but these
> rules should rather vary per year as well.

It is certainly deficient.  We have wrapped it here with a mechanism that locates rules based upon the year, but we merely smoothed over the multiple-changes-per-year problem by picking the dominant values for a given year.  It's a hack, but good enough for our purposes.

_____
Rob Stewart                           robert.stewart_at_[hidden]
Software Engineer                     using std::disclaimer;
Dev Tools & Components
Susquehanna International Group, LLP  http://www.sig.com

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