[egenix-users] Roundoff problem in DateTime

[Reggie Dugard]

Sorry about that last e-mail, I included the attributes of the DateTime
instance BEFORE doing the addition (too little sleep I guess).  Here are
the ones you asked for.

Reggie


On Mon, 2002-07-08 at 11:36, Reggie Dugard wrote:
> I downloaded and compiled the beta 2 version of 2.1.0 and unfortunately
> it didn't help.  I've printed out all the attributes below, as you
> requested.
> 
> Let me know if you need anything else.
> 
> Reggie
> 
> 
> Python 2.2.1 (#1, Apr 29 2002, 15:21:53) 
> [GCC 3.0.3] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
> >>> import mx.DateTime
> >>> mx.DateTime.__version__
> '2.1.0'
> >>> t = mx.DateTime.DateTimeFromAbsDateTime(730488,81317.647058823524)
> >>> t
> <DateTime object for '2001-01-03 22:35:17.65' at 8134e58>

>>> t += 1.0/17.0
>>> t
<DateTime object for '2001-01-03 24:00:00.00' at 818b088>
>>> for attr in t.__members__:
...     print attr, ':', getattr(t,attr)
... 
year : 2001
month : 1
day : 3
hour : 24
minute : 0
second : 0.0
absdays : 730488.0
absdate : 730488
abstime : 86400.0
yearoffset : 730485
is_leapyear : 0
day_of_week : 2
day_of_year : 3
days_in_month : 31
tz : PST
dst : 0
iso_week : (2001, 1, 3)
mjd : 51913.0
tjd : 1913.0
tjd_myriad : 245
jdn : 2451913.5
calendar : Gregorian
>>> 


> 
> On Mon, 2002-07-08 at 01:33, M.-A. Lemburg wrote:
> > Reggie Dugard wrote:
> > > I'm using what I believe to be the latest version of mx.DateTime (2.0.3)
> > > and I seem to have discovered a roundoff problem.  The problem occurs on
> > > Redhat 7.1, but not under Windows 2000 SP2.  Both are running the same
> > > versions of python and mx.DateTime.
> > > 
> > > After performing a floating point addition, I'm getting a time of
> > > 24:00:00 instead of getting 00:00:00 for the next day.  The release
> > > notes mention a similar problem and seem to indicate that it has already
> > > been addressed.  I'm able to consistently reproduce this my problem with
> > > the simple example below.
> > > 
> > > So, I was wondering if anyone else has this problem or if there is a
> > > patch/known workaround for it.
> > 
> > Could you check whether the problem still persists with the
> > latest egenix-mx-base beta 2 ? (see the mailing list archives
> > for all the URLs)
> > 
> > > Reggie Dugard
> > > Merfin, LLC
> > > 
> > > $ uname -a
> > > Linux auk 2.4.9-34 #1 Sat Jun 1 06:10:23 EDT 2002 i686 unknown
> > > $ python
> > > Python 2.2.1 (#1, Apr 29 2002, 15:21:53) 
> > > [GCC 3.0.3] on linux2
> > > Type "help", "copyright", "credits" or "license" for more information.
> > > 
> > >>>>import mx.DateTime
> > >>>>mx.DateTime.__version__
> > >>>
> > > '2.0.3'
> > > 
> > >>>>t = mx.DateTime.DateTimeFromAbsDateTime(730488, 81317.647058823524)
> > >>>>t
> > >>>
> > > <DateTime object for '2001-01-03 22:35:17.64' at 8134e20>
> > > 
> > >>>>t + 1.0/17.0
> > >>>
> > > <DateTime object for '2001-01-03 24:00:00.00' at 8166700>
> > 
> > Could you provide a printout of the values of all attributes
> > this instance has (both on Windows and Linux) ?
> > 
> > t = ...
> > for attr in t.__members__:
> >      print attr, ':', getattr(t, attr)
> > 
> > Thanks,
> > -- 
> > Marc-Andre Lemburg
> > CEO eGenix.com Software GmbH
> > _______________________________________________________________________
> > eGenix.com -- Makers of the Python mx Extensions: mxDateTime,mxODBC,...
> > Python Consulting:                               http://www.egenix.com/
> > Python Software:                    http://www.egenix.com/files/python/
> > 
> > 
> > _______________________________________________________________________
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> > http://lists.egenix.com/mailman/listinfo/egenix-users
> 
> 
> 
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