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Re: st: working with timestamps with milliseconds


From   Michael Mitchell <Michael.Norman.Mitchell@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: working with timestamps with milliseconds
Date   Sat, 20 Feb 2010 18:17:42 -0800

Dear David

  Ah, you have been bitten by the need to store date/time values as
-double- precision variables. Otherwise, as you see, precision is
lost. So, you would instead specify

gen double time2 = clock(time, "MDY hms")

  and that should work for you.

Best regards,

-- 
Michael N. Mitchell
See the Stata tidbit of the week at...
http://www.MichaelNormanMitchell.com
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On Sat, Feb 20, 2010 at 5:29 PM, David Souther
<davidsoutheremail@gmail.com> wrote:
> I couldn't find a solution to this in the Statalist archives, and this
> may be in the dates/times help file but I've read through it a couple
> of time and cannot find (or probably don't understand this file enough
> to find) the solution for how to work with milliseconds.
> Every time I format a timestamp that includes the MDY along with
> hours, minutes, seconds and milliseconds, the seconds/milliseconds are
> off by a minute or so.  I did see the section on leap seconds, but I"m
> not sure how that plays into my example and if there is a way to just
> show and work with the exact timestamp that I input into Stata.
> Here's what I do
>
> clear
> inp str30 time
> "1-22-2007 3:44:22"
> "1/23/2008 02:23:11.11"
> end
>
> gen time2 = clock(time, "MDY hms")
> format time2 %tC
>
> gen d2 = clock("2/22/2002 14:22:33.232", "MDY hms")
> format d2 %tc
>
>
> This gives me --
>
>     +-----------------------------------------------------------------+
>     |                  time                time2                   d2 |
>     |-----------------------------------------------------------------|
>  1. |     1-22-2007 3:44:22   22jan2007 03:43:35   22feb2002 14:23:02 |
>  2. | 1/23/2008 02:23:11.11   23jan2008 02:23:17   22feb2002 14:23:02 |
>     +-----------------------------------------------------------------+
> Notice that the time changed in from things like 3:44:22  to 3:43:35.
>
> I tried using %tC as well.  I use Stata 11 on Windows.  Any hints?
>
> Thanks,
>
> David
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