Re: [Boost-users] Date_time library question

From: Bart (bartmann.nsd_at_[hidden])
Date: 2005-09-20 16:34:58

On Tue, 20 Sep 2005 11:41:33 -0500, Michal Lijowski wrote:

> Is the only way to initialize date and ptime 
> using strings like
>  date d(from_simple_string(s));
> 
> NOT  stringstreams
> 
>         stringstream ss("2004-Jan-1");
>         date;
>         ss >> d;
> 
>  Michal
> 

Using boost 1.33 you can use either method. If you use the stringstream
method, you do not have to link with the library. The
to_*_string & from_*_string functions require linking.

In the following example, the date will first be initialized to
not_a_date_time, and then set to 2004-Jan-01.
  date d; // d == not_a_date_time
  std::stringstream ss("2004-Jan-01");
  ss >> d; // d == 2004-Jan-01

Also note, the default format for streaming in dates it "%Y-%b-%d". The %d
flag requires two digits, so "2004-Jan-1" will not parse correctly and
leave it set to not_a_date_time.

It is possible to "turn-on" exceptions to catch these kinds of errors. 
See: http://tinyurl.com/8qzu4 for details.

Bart