Re: [Boost-users] date_time: UTC to local time conversion

From: Cory Nelson (phrosty_at_[hidden])
Date: 2005-02-28 22:53:47

Thanks, I'll check it out.

On Mon, 28 Feb 2005 19:48:36 -0700, Jeff Garland
<jeff_at_[hidden]> wrote:
> On Mon, 28 Feb 2005 18:09:21 -0800, Cory Nelson wrote
> > Is there a function in date_time to do UTC to local time conversions?
> 
> In 1.32 there are some primative tools to help your if you know things like
> the timezone offset you want to convert from at compile time.  See
> 
> http://www.boost.org/doc/html/date_time/posix_time.html#date_time.posix_time.local_time_adjust
> 
> for more information.
> 
> In CVS, and should be ready for 1.33, there is a major new feature for local
> times and dynamic timezones.  In a nutshell you can convert to local time
> using posix tz specifications or using a timezone database.  So let's say you
> have the local time in sydney austrialia and you want to convert to UTC:
> 
>     //construct the tz for sydney au
>     boost::shared_ptr<time_zone_base>
>       sydney_tz(new posix_time_zone("EST+10EST,M10.5.0,M3.5.0/03:00"));
>     date d(2004,Jan,1);
>     time_duration td = hours(1) + minutes(15);
>     //2004-Jan-1 01:15:00 in sydney
>     local_date_time sidney_time(d,td,sydney_tz);
>     ptime utc = sidney_time.utc_time();
> 
>     //or the other way starting with a UTC time and going to local
>     ptime some_utc_time(....);
>     local_date_time sydney_time(some_utc_time, sydney_tz);
> 
> You can find the new online docs at:
> http://www.meta-comm.com/engineering/resources/cs-win32_metacomm/doc/html/date_time/local_time.html
> Feedback appreciated.
> 
> Only warning is that we haven't worked out all the kinks in I/O and
> portability of this new code.
> 
> HTH,
> 
> Jeff
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> 

-- 
Cory Nelson
http://www.int64.org