Re: [boost] [date_time] Time zone improvements

Subject: Re: [boost] [date_time] Time zone improvements
From: Luke Camden (lukeocamden_at_[hidden])
Date: 2011-04-26 05:40:51

Rutger ter Borg-2 wrote:
> 
> Hey Luke,
> 
> unfortunately my work didn't lead to anything yet except for having 
> implemented the ability to read and use the binary format of the 
> timezone database files (both the 32 and 64 bit parts).
> 
> time_zone_base has a couple of presumptions which prevent a correct 
> implementation of the Olson database:
> 
> 1) dst_local_start_time / end_time assumes one such event per year (may 
> be less or more in time zone transition years / countries that don't do 
> DST). A correct interface should assume a series of zone transition 
> points (usually two per year for a given area/location).
> 
> 2) all *zone_name, *zone_abbrev functions should be a function of time, 
> i.e., it needs a ptime parameter. The zone naming may change over time 
> (e.g., if a country changes their time zone).
> 
> Cheers,
> 
> Rutger
> 

Thanks, Rutger.

Realistically, is a change to time_zone_base a possibility? How many people
depend directly on this interface? Or could we extend the interface with the
required functions without breaking existing code?

Cheers,
Luke

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