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st: RE: Re: question about working with dates and times
From
"Visintainer, Paul" <[email protected]>
To
"'[email protected]'" <[email protected]>
Subject
st: RE: Re: question about working with dates and times
Date
Tue, 27 Jul 2010 13:21:27 -0400
Thanks, Joe. The examples are really helpful.
-p
________________________________________________
Paul F. Visintainer, PhD
Professor of Medicine, Tufts University School of Medicine
Director of Epidemiology and Biostatistics
Baystate Medical Center
Division of Academic Affairs - 3rd Floor
280 Chestnut Street
Springfield, MA 01199
(T) 413.794.7686
(F) 413.794.7689
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Joseph Coveney
Sent: Tuesday, July 27, 2010 9:53 AM
To: [email protected]
Subject: st: Re: question about working with dates and times
Paul Visintainer wrote:
Thanks, Joe. I think I get it. Rather than just specifying the interval, one
specifies the desired interval from the zero-point.
--------------------------------------------------------------------------------
In your original post, you mentioned wanting 36 hours, 14 days, etc. You can
take advantage of the -tc()- pseudofunction by treating
-tc("02jan1960 00:00:00")- as a constant, representing how many milliseconds
there are in one day. See below for the 36-h, 14-d examples.
The limitation of this tactic is illustrated as -day2- in my first reply,
namely, the increment for "3 months" depends upon which three months of the
year you're trying to span.
Joseph Coveney
. generate double day0 = tc("06oct2007 00:00:00")
.
. * 36 h
. generate double day1 = day0 + ///
> 36 / 24 * tc("02jan1960 00:00:00")
.
. * 14 days
. generate double day2 = day0 + ///
> 14 * tc("02jan1960 00:00:00")
.
. format day? %tc
.
. list day?, noobs
+--------------------------------------------------------------+
| day0 day1 day2 |
|--------------------------------------------------------------|
| 06oct2007 00:00:00 07oct2007 12:00:00 20oct2007 00:00:00 |
+--------------------------------------------------------------+
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