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Re: st: datetime different in Stata 12?


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: datetime different in Stata 12?
Date   Mon, 8 Oct 2012 17:27:13 +0100

The handling of dates and times did not change between 11.2 and 12.

These dates are just different; I suspect that you have uncovered a
glitch in the help file, in that an example has been only partially
updated.

. clear

. set obs 1
obs was 0, now 1

. generate double datetime_1 = 1479597200000

. generate double datetime_2 = tc(20jan2010 09:15:22.120)

. format datetime_* %tc

. list

     +-----------------------------------------+
     |         datetime_1           datetime_2 |
     |-----------------------------------------|
  1. | 19nov2006 23:13:20   20jan2010 09:15:22 |
     +-----------------------------------------+

. format datetime_* %21.0f

. list

     +-------------------------------+
     |    datetime_1      datetime_2 |
     |-------------------------------|
  1. | 1479597200000   1579598122120 |
     +-------------------------------+


On Mon, Oct 8, 2012 at 5:07 PM, Skipper Seabold <jsseabold@gmail.com> wrote:
> Can anyone confirm that what's listed here [1] is correct for version
> 12? I'm using Stata 11.2 and I'm not getting this. Am I doing
> something wrong? According to the docs, the datetime/c listing should
> be
>
> 20jan2010 09:15:22.120
>
> In 11.2 I get
>
> 19nov2006 23:13:20
>
> What changed? Seems a bit too big to be leap years and leap seconds.
> Perhaps it's just a mistake?
>
> Similarly, the datetime/C value is not this either.
>
> set obs 1
> generate double datetime_c = 1479597200000 in 1
> format datetime_c %tc
>
> Now if I do
>
> clear
> set obs1
> generate double datetime_c = tc(20jan2010 09:15:22.120) in 1
>
> I get
>
> 1579598122120
>
> Surely the behavior of something so fundamental didn't change between
> 11.2 and 12.
>
> Thanks,
>
> Skipper
>
> [1] http://www.stata.com/help.cgi?datetime#s2
>
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