[Zope-dev] DateTime Error?

[Jonothan Farr]

If it was this easy to fix then shouldn't it be possible to fix the DateTime
class?

-jfarr

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----- Original Message -----
From: Lindell Alderman <lindell@atlantis.otak.com>
To: Jonothan Farr <jfarr@real.com>
Cc: <zope-dev@zope.org>
Sent: Tuesday, March 21, 2000 3:46 PM
Subject: Re: [Zope-dev] DateTime Error?


> This is how I worked around it.  I derived a class from DateTime.  Then
> I overrode the minute and second methods.  My new methods called
> the time module directly and return the right number.  This worked
> well.  Of course I knew exactly which methods I needed so I didn't
> have to override a lot of different methods.
>
> -L
>
> On Tue, Mar 21, 2000 at 03:28:56PM -0800, Jonothan Farr wrote:
> > This is definitely a problem. The common explanation is floating point
errors.
> >
> > -jfarr
> >
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> > Hi! I'm a signature virus.
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> >
> > ----- Original Message -----
> > From: Lindell Alderman <lindell@atlantis.otak.com>
> > To: <lindell@atlantis.otak.com>
> > Cc: <zope-dev@zope.org>
> > Sent: Tuesday, March 21, 2000 3:18 PM
> > Subject: [Zope-dev] DateTime Error?
> >
> >
> > > I think I have found an inconsistency in the Zope DateTime class.
> > > The following piece of code illustrates it.
> > >
> > > #!/usr/bin/python
> > > import DateTime
> > > now = DateTime.DateTime()
> > >
> > > for x in range(0,24):
> > >   dt = DateTime.DateTime('%04d-%02d-%02d %02d:30:00' % (now.year(),
> > >                                                         now.month(),
> > >                                                         now.day(),x))
> > >   print dt.parts()
> > >
> > > # end of code
> > >
> > > Here is the output on my Debian Linux box.
> > >
> > > (2000, 3, 21, 0, 30, 0.0, 'US/Pacific')
> > > (2000, 3, 21, 1, 30, 0.0, 'US/Pacific')
> > > (2000, 3, 21, 2, 30, 0.0, 'US/Pacific')
> > > (2000, 3, 21, 3, 30, 0.0, 'US/Pacific')
> > > (2000, 3, 21, 4, 30, 0.0, 'US/Pacific')
> > > (2000, 3, 21, 5, 30, 0.0, 'US/Pacific')
> > > (2000, 3, 21, 6, 30, 0.0, 'US/Pacific')
> > > (2000, 3, 21, 7, 30, 0.0, 'US/Pacific')
> > > (2000, 3, 21, 8, 29, 60.0, 'US/Pacific')
> > > (2000, 3, 21, 9, 30, 0.0, 'US/Pacific')
> > > (2000, 3, 21, 10, 30, 0.0, 'US/Pacific')
> > > (2000, 3, 21, 11, 30, 0.0, 'US/Pacific')
> > > (2000, 3, 21, 12, 30, 0.0, 'US/Pacific')
> > > (2000, 3, 21, 13, 30, 0.0, 'US/Pacific')
> > > (2000, 3, 21, 14, 30, 7.27595761418e-12, 'US/Pacific')
> > > (2000, 3, 21, 15, 30, 0.0, 'US/Pacific')
> > > (2000, 3, 21, 16, 30, 0.0, 'US/Pacific')
> > > (2000, 3, 21, 17, 30, 7.27595761418e-12, 'US/Pacific')
> > > (2000, 3, 21, 18, 30, 0.0, 'US/Pacific')
> > > (2000, 3, 21, 19, 30, 0.0, 'US/Pacific')
> > > (2000, 3, 21, 20, 30, 0.0, 'US/Pacific')
> > > (2000, 3, 21, 21, 30, 0.0, 'US/Pacific')
> > > (2000, 3, 21, 22, 30, 0.0, 'US/Pacific')
> > > (2000, 3, 21, 23, 30, 0.0, 'US/Pacific')
> > >
> > > Notice that at 8:30 am the DateTime class prints 8:29:60
> > > instead of 8:30:00.  Then notice at 2:30 and 5:30 the number
> > > of seconds is slight off too.  I have not found the cause yet.
> > > Has anyone noticed this problem too?
> > >
> > > Norman Alderman
> > >
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