Caught out by daylight saving :-(

[CinnamonDonkey]

Hi Chris,

Thanx for the link... I had already found that. My problem is not
finding information but more understanding it. I've only been
Pythoning for a short while and I don't fully understand what the
documentation is getting at sometimes.

Is it saying that I should define a new class inheriting from tzinfo
and refine the behaviour of the dst() function? If so, then what do I
do with the class?



On 30 Mar, 13:08, Chris <cwi... at gmail.com> wrote:
> On Mar 30, 1:47 pm, CinnamonDonkey <CinnamonDon... at googlemail.com>
> wrote:
>
>
>
> > Hi All,
>
> > I had the following bit of code which was working fine until we went
> > into Daylight saving this weekend, now the result is an hour out.
>
> >     timeString = "20090330 15:45:23"
>
> >     timeFormat = '%Y-%m-%d %H:%M:%S'
>
> >     modificationTime = datetime.datetime.utcfromtimestamp( time.mktime
> > ( time.strptime( timeString, timeFormat ) ) )
> >     minutesToAdvance = datetime.timedelta( minutes=5 )
>
> >     modificationTime = modificationTime + minutesToAdvance
>
> >     datetimeString = str ( modificationTime ).replace( ' ', 'T' )
>
> > The expected result should be:
>
> >     datetimeString = "20090330T15:50:23"
>
> > But instead I get:
>
> >     datetimeString = "20090330T14:50:23"
>
> > I believe it is going wrong at either the mktime() or utcfromtimestamp
> > () stage.
>
> > What is the correct way to fix this compensating for daylight saving
> > automatically?
>
> > Regards,
> > SHaun >8)
>
> Take a look at the datetime docshttp://docs.python.org/library/datetime.html#datetime.tzinfo.dst