PSPP-BUG: [bug #30708] DATESUM, DATEDIFF clarifications

[Ben Pfaff]

URL:
  <http://savannah.gnu.org/bugs/?30708>

                 Summary: DATESUM, DATEDIFF clarifications
                 Project: PSPP
            Submitted by: blp
            Submitted on: Sun Aug  8 16:11:18 2010
                Category: Numerical Errors
                Severity: 5 - Average
                  Status: None
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
                 Release: None
                  Effort: 0.00

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Details:

From: "Daniel E WILLIAMS" <address@hidden>

> The time of day appears to count for DATEDIFF.  The difference in years
> between 1 Jan 2004
> at 2pm and 1 Jan 2005 at 1pm equals zero, while the difference in years
> between 1 Jan 2004
> at 2pm and 1 Jan 2005 at 3pm equals one.
>  
> Time of day also appears to count for DATESUM.  1 Feb at 14:00, with one
month
> added, becomes 1 Mar at 14:00.  The code I sent tries three different
versions
> of DATESUM; the default, "rollover", and "closest" methods.  I cannot
figure
> out what the difference between "rollover" and "closest", but I know that
> "closest" is the default.
>  
> You are right.  The SPSS documentation is not very clear on this issue. 
I've
> attached code and an output file that shows the calculations I made. 
Thanks.




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File Attachments:


-------------------------------------------------------
Date: Sun Aug  8 16:11:18 2010  Name: date_stuff_for_SPSS.SPS  Size: 1kB  
By: blp

<http://savannah.gnu.org/bugs/download.php?file_id=21172>
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Date: Sun Aug  8 16:11:18 2010  Name: date_stuff_for_SPSS.sav  Size: 871B  
By: blp

<http://savannah.gnu.org/bugs/download.php?file_id=21173>

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