Re: [Boost-users] Question on Posix timezone string

Subject: Re: [Boost-users] Question on Posix timezone string
From: Leon Mlakar (leon_at_[hidden])
Date: 2018-12-28 22:36:33

On 28.12.2018 22:30, Mats Webjörn/WIKAB wrote:
>
> Hi Leon,
>
> Yes, but the problem is that the offset for Berlin in Boost 
> date_time_zonespec.csv is +01, not -01
>
Just to avoid ambiguity - it's probably not the date_time_zonespec.csv 
entry that is broken (local system may use any notation they wish), and 
from what I saw Boost.DateTime does not claim that this file has 
contains Posix strings. Quite the opposite, the documentation on the 
offset field is very explicit:

- GTM offset: This is the number of hours added to utc to get the local 
time before any daylight savings adjustments are made. Some examples 
are: America/New_York offset -5 hours, and Africa/Cairo offset +2 hours. 
The format must follow the length-of-time format described above.

On the other hand, the documentation for to_posix_string() method does 
claim that it, in accordance with its name, returns a Posix compliant 
string.

Cheers,

Leon