[Tutor] Daylight saving time issue

[Titu Kim]

You have a good point. But the start date and end date
of dst for every year is different,  how can this
problem be taken care of. Thanks.

--- dman <dsh8290@rit.edu> wrote:
> On Tue, Nov 06, 2001 at 05:40:53PM -0800, Titu Kim
> wrote:
> | Hi,
> |    I am trying to determine a given date is in dst
> or
> | not. For instance, if i have month(mm), day(dd),
> | year(yyyy) information plus the beginning
> (00:00:01)
> | or ending (23:59:59) of this day, i would like to
> | determine the given date/time is in daylight
> saving
> | time. To make the situation complecated, i also
> have
> | to consider the day when day light saving time
> occurs,
> | which is in Oct and April each year. Any
> suggestion is
> | very appreciated.
> 
> Create some date objects.
> 
> dst_start = day of year dst starts
> dst_end = day of year dst ends
> 
> if dst_start < myday < dst_end :
>     print "is DST"
> else :
>     print "not DST"
> 
> 
> The real trick now is to define the date objects and
> have the
> comparison ignore the year.  I know java has a
> Calendar class, but at the very
> least a tuple might work.  
> 
> Let's see :
> 
> $ python
> Python 1.5.2 (#0, Oct 20 2001, 16:30:45)  [GCC
> 2.95.4 20011006 (Debian prerelease)] on linux2
> Copyright 1991-1995 Stichting Mathematisch Centrum,
> Amsterdam
> >>> dst_end = (9 , 14)
> >>> dst_start = (3 , 14)
> >>> dst_start < dst_end
> 1
> >>> today = (10 , 3)
> >>> print dst_start < today < dst_end
> 0
> >>>
> 
> (I made the months 0..11)
> Honestly, though I don't know the dates for DST but
> this should give
> an idea as to how to approach it.  If DST is during
> the winter, then
> you would certainly want a function to tell you if
> the date is DST :
> 
> def is_dst( date ) :
>     return date < dst_start or date > dst_end 
> 
> 
> HTH,
> -D
> 
> 
> _______________________________________________
> Tutor maillist  -  Tutor@python.org
> http://mail.python.org/mailman/listinfo/tutor


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