topic Re: Shifting a datetime value by a number of years in SAS Programming

Shifting a datetime value by a number of years

DocMartin — Tue, 22 Aug 2017 17:08:17 GMT

I received a dataset in which many of the observations have a datetime value where the year is 2076 or 2077. Obviously these values are off by 60 years. So how can I modify the year value in that datetime variable so that the right year is in there.

ex. DOB = 02/15/2076 13:00 should be 02/15/2016 13:00

DOB = 05/26/2077 9:35 should be 05/26/2017 9:35

Thanks!

Andrew

Re: Shifting a datetime value by a number of years

Reeza — Tue, 22 Aug 2017 17:09:41 GMT

Use INTNX.

Re: Shifting a datetime value by a number of years

DocMartin — Tue, 22 Aug 2017 17:27:02 GMT

That does not work. When I try newdob = intnx("year", dob, -60) all I get is 1/1/1960. Plus, I need the time portion to remain stable.

Re: Shifting a datetime value by a number of years

Reeza — Tue, 22 Aug 2017 17:31:21 GMT

You stated you had a datetime variable? If so, then Year is not the correct interval, it's DTYEAR I think. For the remaining values to be the same use the fourth parameter which controls the alignment.

newdob = intnx("dtyear", dob, -60, 's')

Re: Shifting a datetime value by a number of years

PaigeMiller — Tue, 22 Aug 2017 17:31:59 GMT

@DocMartin wrote:

That does not work. When I try newdob = intnx("year", dob, -60) all I get is 1/1/1960. Plus, I need the time portion to remain stable.

You have a datetime value, not a date value.

Use

intnx("dtyear",dob,-60)

Re: Shifting a datetime value by a number of years

Reeza — Tue, 22 Aug 2017 17:32:02 GMT

Did you import this data from Excel originally?

Re: Shifting a datetime value by a number of years

DocMartin — Tue, 22 Aug 2017 17:41:59 GMT

Yes, unfortunately.

Re: Shifting a datetime value by a number of years

Reeza — Tue, 22 Aug 2017 18:18:57 GMT

@DocMartin wrote:
Yes, unfortunately.

Assuming this means you did import it from Excel, then I would suggest an approach noted here:

https://communities.sas.com/t5/Integration-with-Microsoft/Importing-date-time-variables-from-Excel-into-SAS/td-p/129881

There's a specific value that you need to use to account for Excel date to SAS date but I can't remember the rule, if you're sure it's 60 years this appraoch will work though.