[Zope] Subtracting 2 dates from each other

[Peter Bengtsson]

What do you really want?

>>> from DateTime import DateTime
>>> date1 = DateTime('2001/05/25 20:30:00')
>>> date2 = DateTime('2001/05/25 19:00:00')
>>> res = date1 - date2
>>> type(res)
<type 'float'>
>>> hours = res*24
>>> type(hours)
<type 'float'>
>>>  print hours
1.5

Do you want to calculate how many hours there are between two dates? Or how
many days (like 'res' above)?
If your result is unchanging even though you change the dates, could it be
because you're doing some int() roundoff or something so that you loose the
accuracy in the hours; like this:
>>> print int(res*24)
1

Peter

----- Original Message -----
From: "Gitte Wange" <gitte@mmmanager.org>
To: "Tino Wildenhain" <tino@wildenhain.de>
Cc: <zope@zope.org>
Sent: Monday, May 28, 2001 2:12 PM
Subject: Re: [Zope] Subtracting 2 dates from each other


> On Monday 28 May 2001 14:04, you wrote:
> > Hi Gitte,
> >
> > how about Date1 - Date2 ? :)
> >
> > Of course they must be DateTime instances, not strings.
> >
> > Regards
> > Tino
> >
>
> That doesn't work ..
> Well it subtracts something .... but the result is very weird.
> An example:
> Date1 = 2001/05/25 20:30:00
> Date2 = 2001/05/25 19:00:00
>
> Expected result: 01:30:00
> The result  I got: 01:00:00
>
> And changing the dates doesn't change the result ... why ???
>
> Gitte
>
> > --On Montag, 28. Mai 2001 08:15 +0200 Gitte Wange <gitte@mmmanager.org>
> >
> > wrote:
> > > Hello,
> > >
> > > I need to subtract to dates from each other.
> > > I have searched the archives but haven't found anything useful.
> > > Hope someone here could help me.
> > >
> > > Regards,
> > > --
> > > ************************
> > > Gitte Wange Jensen
> > >
> > > System Squid Developer
> > > MMManager Aps
> > > +45 29 72 79 72
> > >
> > > gitte@mmmanager.org
> > > ************************
> > >
> > > _______________________________________________
> > > Zope maillist  -  Zope@zope.org
> > > http://lists.zope.org/mailman/listinfo/zope
> > > **   No cross posts or HTML encoding!  **
> > > (Related lists -
> > >  http://lists.zope.org/mailman/listinfo/zope-announce
> > >  http://lists.zope.org/mailman/listinfo/zope-dev )
>
> _______________________________________________
> Zope maillist  -  Zope@zope.org
> http://lists.zope.org/mailman/listinfo/zope
> **   No cross posts or HTML encoding!  **
> (Related lists -
>  http://lists.zope.org/mailman/listinfo/zope-announce
>  http://lists.zope.org/mailman/listinfo/zope-dev )