Re: Daylight savings time timezone conversion automatically?

Is there a way to see if DST is in effect on a
returned time zone object ?
For instance, i have got a loop like this:

my @list = DateTime::TimeZone->all_names;
foreach $zone (@list) {
        next unless ($zone =~ /\//);                    # skip timezone links in the list
        $dt = DateTime->now();                          # current computer time
        $tz = DateTime::TimeZone->new( name => $zone ); # timezone

        $offset = $tz->offset_for_datetime($dt);        # offset from UTC for this timezone
        $TZ = $tz->short_name_for_datetime($dt);        # timezone name (e.g. CET)
        $dt->add(seconds =>  $offset);                  # convert computer time to time in timezone
        $hoffset = $offset / 3600;                      # offset in hours

        printf "%40s\t%s\tGMT diff = %g\t%4s\t",$zone,$TZ, $hoffset,$DST;
        printf "%d/%02d/%02d %02d:%02d\n",$dt->year,$dt->month,$dt->day,$dt->hour,$dt->minute;
        }

How can i see for each zone displayed if it is in DST?
The only way i could think of is add an offset of half a year
to the timezone and compare the time's, but that seems a bit overdone
since the info is there somewhere allready.

thanks for your help.
Ewald...

On Wed, Mar 12, 2008 at 04:54:07PM -0500, Dave Rolsky wrote:
> On Thu, 13 Mar 2008, Rick Measham wrote:
> 
> >William Heath wrote:
> >>I think I figured it out, what is important to understand is that you
> >>can't choose EST, you must choose a country/city for the function to
> >>adjust for DST automatically.  My question was probably too simple for
> >>you to give me this solution but I did figure it out.  Does that make
> >>sense to you?
> >
> >Absolutely. The time zones supported by DateTime are designed to be 
> >robust, not only for today but back to 1970.
> 
> Actually, most of the them go back quite a bit further, to the 1910s or 
> so, or whenever the country in question started using time zones, which 
> obviously varies from place to place.
> 
> It even tries to go back earlier by defining a LMT (local mean time, I 
> believe) rule that applies for all times before the first real time zone. 
> This isn't so useful, though because the LMT for America/Chicago is really 
> for Chicago only (and anything along the same longitude line), and doesn't 
> apply to other cities in the same time zone (like Minneapolis).
> 
> 
> -dave
> 
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