Date:         Thu, 1 May 2003 13:33:08 -0400
Reply-To:     Mark Casazza <mark.casazza@domino1.cuny.edu>
Sender:       "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From:         Mark Casazza <mark.casazza@domino1.cuny.edu>
Subject:      Re: time interval
Comments: To: "Yampolskaya, Svetlana" <yampol@fmhi.usf.edu>
In-Reply-To:  <CF25F31EC35DD411B3A500B0D020F0F005AD8EEF@mirage.fmhi.usf.edu>
Content-Type: text/plain; charset="iso-8859-1"

Hi Lana,

The days part isn't difficult, it looks like:

compute interval = ctime.days(recent_date - old_date).

As for the months, that's more difficult since months have different numbers
of days.  If you can settle for an approximation divide the number of days
(interval) by 30 and you'll be reasonably close.  If you need to compute
this for the actual months involved, take a look at Raynald's site--I think
he worked this out once before and the code's probably there.

Mark Casazza
Director of Academic Information
The City University of New York
555 West 57th St. Suite 1240
New York, NY 10019

phone: 212.541.0396
fax:   212.541.0372
mark.casazza@mail.cuny.edu

-----Original Message-----
From: SPSSX(r) Discussion [mailto:SPSSX-L@LISTSERV.UGA.EDU]On Behalf Of
Yampolskaya, Svetlana
Sent: Thursday, May 01, 2003 1:08 PM
To: SPSSX-L@LISTSERV.UGA.EDU
Subject: Re: time interval


Dear List,

I have two dates (two date variables (e.g., mm/dd/yyyy). I need to calculate
the difference between them in days. How can I do it? Please help.

And then what if I need that difference in months?


Thank you in advance,

Lana