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Re: st: ym() date function is acting strangely


From   "William Gould, StataCorp LP" <wgould@stata.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: ym() date function is acting strangely
Date   Thu, 15 Dec 2011 15:50:59 -0600

Gabi Huiber <ghuiber@gmail.com> writes, 

> I do this:
> 
> clear
> set obs 10
> gen year=2010
> gen month=_n
> gen date1=ym(year, month)
> format date1 %tm
> 
> And I get this:
> 
> year	month	date1
> 2010	1	23aug1961
> 2010	2	24aug1961
> 2010	3	25aug1961
> 2010	4	26aug1961
> 2010	5	27aug1961
> 2010	6	28aug1961
> 2010	7	29aug1961
> 2010	8	30aug1961
> 2010	9	31aug1961
> 2010	10	01sep1961
> 
> How on Earth is that possible? A minute ago ym() was working fine, I swear.

I suspect Gabi did not type 

        . format date1 %tm

but instead typed 

        . format date1 %td

If Gabi had done that, the above output is exactly what he would get.
And all Gabi needs to do to get the correct output is now type 

        . format date1 %tm

and he will get the correct output.  There is no problem with the -ym()- 
function.  It stored the right values, namely 600, 601, 602, ..., 609.


-- Bill
wgould@stata.com
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