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Re: st: dates


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: dates
Date   Fri, 7 Oct 2011 19:44:07 +0100

Intelligent support for run-together dates was added in Stata 10. (For
Stata 8 and 9. -todate- (SSC) is a work-around.)

If such dates are numeric, then a conversion can be used like

. di date(string(20080105, "%12.0f"), "YMD")
17536

Your splitting, back transforming and recombining are then all
unnecessary. The format argument is needed because otherwise the
-string()- conversion will change the large integer to a power of 10.

. di string(20080105)
2.01e+07

Nick

On Fri, Oct 7, 2011 at 7:07 PM, Pedro Nakashima
<nakashimapedro@gmail.com> wrote:
> For the days that are in the format like 20080105, I usually transform
> them to string, break it with substr() (day, month, year), transform
> back to numeric, and then build the date with the function td=mdy().
>
> I don't know a faster way to do that..
>
> 2011/10/6 Michael Eisenberg <meisenberg713@gmail.com>:
>> Colleagues,
>>
>> I have a list of visit dates for patients.  Unfortunately, the format
>> is not constant.
>>
>> Most are listed with the year, month, day such as 20080105 for Jan 5,
>> 2008 but some are listed only with the year and month 200801 for Jan
>> 2008.
>>
>> I attempted to convert them into stata dates with the commands below
>> without success.
>>
>> gen ndate = date(dx_date, "YMD")
>> or
>> gen ndate = date(dx_date, "CCYYNNDD")
>>
>> Can stata handle such inconsistent data?

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