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st: RE: Re: question about working with dates and times

From   "Visintainer, Paul" <>
To   "''" <>
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.


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: [] On Behalf Of Joseph Coveney
Sent: Tuesday, July 27, 2010 9:53 AM
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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