topic Re: SAS date in SAS Programming

SAS date

DartRodrigo — Tue, 14 Jul 2015 14:52:53 GMT

Hi, i have a table with loads of dates.

I need a way to look this table everytime i run six months ago.

I use this Where my_date >= '14jul/2015:00:00:00'dt - 180;

But it does not work.

Tks,

Rodrigo Dartibali Elias

Re: SAS date

Reeza — Tue, 14 Jul 2015 15:00:34 GMT

datetime are in seconds, so 6 'months' ago is 30*24*60*60 seconds, except you have months that vary in length.

I recommend using intck or intnx functions.

Re: SAS date

RW9 — Tue, 14 Jul 2015 15:03:31 GMT

It does work, what you are doing is subtracting 180 miliseconds from 14Jul2015 and then any date which is >= to that output. You need to understand how dates, times, and datetime variables are stored internally - read up in the manual on this. As for your problem, I would recommend using intck:

where my_date >= intck('month',datepart('14jul2015:00:00:00'dt),-6)

What this is doing is first, taking the datepart of the datetime variable as we are not interested in time part. Then it is using intck to move, as a monthly interval 6 months back, and finally using this date value as a comparison.

Re: SAS date

DartRodrigo — Tue, 14 Jul 2015 15:20:46 GMT

Wow, this helps a lot, guys.

Thank you

Re: SAS date

ballardw — Tue, 14 Jul 2015 16:36:41 GMT

And go back and tell however named a DATETIME variable as a DATE to cut it out. :smileymischief: