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Re: st: duplicated datetime variable differs from original datetime variable it was derived from


From   Milena Przheska <[email protected]>
To   [email protected]
Subject   Re: st: duplicated datetime variable differs from original datetime variable it was derived from
Date   Tue, 12 Nov 2013 12:51:27 +0100

When I try to fit a mixed effects model with the time1 variable as
defined above, I get an error message "time variable must be
integer-valued".

I do need the time variable to be by the second, otherwise I will have
duplicate values for the time variable.

If you have any suggestions, I would very much appreciate it.

Thank you,
Milena

On Tue, Nov 12, 2013 at 12:41 PM, Nick Cox <[email protected]> wrote:
> Phil has the answer in one. Unfortunately, you do have to keep
> remembering that a date-time to Stata is just an integer, usually
> large, giving time in milliseconds.
>
> . di %14.0f clock("07jun2012 03:11:48", "DMYhms")
>  1654657908000
>
> Numbers that big have to be stored as -double-s.
> Nick
> [email protected]
>
>
> On 12 November 2013 11:33, Phil Clayton <[email protected]> wrote:
>> Dates with times need to be stored in double precision. Try:
>> gen double time1=time
>>
>> See -help datetime-
>>
>> Phil
>>
>> On 12 Nov 2013, at 10:25 pm, Milena Przheska <[email protected]> wrote:
>>
>>> Dear Statalist members,
>>>
>>> When duplicating a time variable by typing
>>>
>>> gen time1 =time
>>>
>>> the new variable time1 is off by several seconds from the variable time, so
>>>
>>> time
>>> 06jun2012 22:44:51
>>> 06jun2012 22:44:54
>>> 06jun2012 22:44:56
>>> 07jun2012 01:39:58
>>> 07jun2012 01:40:05
>>> 07jun2012 01:40:45
>>> 07jun2012 03:09:48
>>> 07jun2012 03:09:48
>>> 07jun2012 03:11:06
>>>
>>> becomes
>>>
>>> time1
>>> 06jun2012 22:45:17
>>> 06jun2012 22:45:17
>>> 06jun2012 22:45:17
>>> 07jun2012 01:40:03
>>> 07jun2012 01:40:03
>>> 07jun2012 01:40:03
>>> 07jun2012 03:09:37
>>> 07jun2012 03:09:37
>>> 07jun2012 03:11:48
>>>
>>>
>>> I would appreciate your help with resolving this problem.
>>>
>>> Thank you all,
>>> Milena
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