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Re: st: Getting end of month


From   "Svend Juul" <SJ@SOCI.AU.DK>
To   <statalist@hsphsun2.harvard.edu>
Subject   Re: st: Getting end of month
Date   Sat, 14 Oct 2006 20:43:15 +0200

Nuno wrote:
 
I'm converting a set of dates to the end of the respective month, for
instance:
20Jan91 -> 31Jan91
10Mar05 -> 30Mar05
Etc.
Does anyone knows a function in Stata that does this automatically? 
---------------------------------------------
 
How about this: 
 
// Create 3 dates for the exercise:
clear
input d m y
20 1 1991
10 3 2005
24 12 2005
end
gen date=mdy(m,d,y)
drop m d y
format date %d
 
// Here we go:
gen dd = day(date)
gen mm = month(date)
gen yyyy = year(date)
gen mm1=mm+1 if mm<12
replace mm1=1 if mm==12
replace yyyy=yyyy+1 if mm==12
gen date1 = mdy(mm1,1,yyyy)-1
format date1 %d
list
 
I just subtracted 1 from the first day in the following month.
But note the small "complication" with December.
 
Hope this helps
Svend

 

 


 
________________________________________________________ 
 
Svend Juul
Institut for Folkesundhed, Afdeling for Epidemiologi
(Institute of Public Health, Department of Epidemiology)
Vennelyst Boulevard 6 
DK-8000 Aarhus C,  Denmark 
Phone, work:  +45 8942 6090 
Phone, home:  +45 8693 7796 
Fax:          +45 8613 1580 
E-mail:       sj@soci.au.dk 
_________________________________________________________ 

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