I don't see an API which will do this. Can I ask you why do you need to know? 
DST changes from place to place and from year to year, it's not inconceivable 
that a location which never had DST before suddenly decides as of year XXXX 
that it will start doing so. I would expect the current APIs which tell you if 
a certain date has DST is about the best you can really do. If you like, every 
location potentially has DST, only if you give a certain date, or time, can you 
say if DST applies to that particular date or time. Observing DST is not really 
a property of the location. 


On 24-Jun-2011, at 6:20 PM, Appa Rao Mulpuri wrote:

> Is there any way to get particular time Zone supports Day Light saving(DST)
> or not. For example, if you take Asia/Kolkata, no DST in any year and for
> America/Chicago, DST is YES.
> 
> I saw following APIs in NSTimeZone, but it is considering the Date and
> returns that date is in DST or not.
> 
> – isDaylightSavingTime
> – isDaylightSavingTimeForDate:
> 
> Apparao
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