topic Combining date month and year into one column for date. in New SAS User

Combining date month and year into one column for date.

klj81 — Mon, 29 Apr 2019 23:48:18 GMT

Hello!

I have a very large data set where birthdays are separated into three columns.

I have Brthmn brthdt and brthyr.

I tried to use the MDY function to create the variable Birthdt which would include the month,date, and year.

The issue is that Brthmn is in the three letter abbreviation format (ex: 'Jan'), so I cannot use MDY because it is not a numeric variable.

Ultimately the date will need to be in the date9 format so if that could be done it would be great.. ALSO. There are some instances where the day is missing and I would need to assign a generic date to that person like date=01 for example. Any tips would be greatly appreciated.

Re: Combining date month and year into one column for date.

Reeza — Tue, 30 Apr 2019 00:49:42 GMT

Date = input(coalesce(day, 1)||mon||year, date9.);
Format date date9.;

Untested code due to lack of sample data.

@klj81 wrote:

Hello!

I have a very large data set where birthdays are separated into three columns.

I have Brthmn brthdt and brthyr.

I tried to use the MDY function to create the variable Birthdt which would include the month,date, and year.

The issue is that Brthmn is in the three letter abbreviation format (ex: 'Jan'), so I cannot use MDY because it is not a numeric variable.

Ultimately the date will need to be in the date9 format so if that could be done it would be great.. ALSO. There are some instances where the day is missing and I would need to assign a generic date to that person like date=01 for example. Any tips would be greatly appreciated.

Re: Combining date month and year into one column for date.

Barkat — Mon, 21 Aug 2023 20:16:45 GMT

I have the same question. I have mentioned a sample data, named have. I would like to combine StartDay, StartMonth, and StartYear to create a StartDate column.

Please help

data have;
input ID $ StartDay StartMonth StartYear ;
cards;
001 10 9 2022
002 4 3 2022
003 2 7 2022
004 7 17 2022
005 10 24 2022
006 11 14 2022
;

Re: Combining date month and year into one column for date.

ballardw — Mon, 21 Aug 2023 20:28:27 GMT

If you have numeric values for month, day and year then use the MDY function. Then assign a format that humans can read in your preferred style.

data have;
   input ID $ StartDay StartMonth StartYear ;
   startdate = mdy(startmonth, startday,startyear);
   format startdate date9.;
cards;
001 10 9 2022
002 4 3 2022
003 2 7 2022
004 7 17 2022
005 10 24 2022
006 11 14 2022
;

BTW, it is preferred on this forum that you start a new question and reference an old one like this. The originator of a question has the ability to mark answers accepted. Also you never know when your question may become considerably more complex or different from the thread you add to.

https://communities.sas.com/t5/SAS-Communities-Library/Working-with-Dates-and-Times-in-SAS-Tutorial/ta-p/424354 has a PDF with much information about dates.

Re: Combining date month and year into one column for date.

Barkat — Mon, 21 Aug 2023 20:36:50 GMT

I used the following code. However the StartDate appears only in first three rows.

data want; set have;
   startdate = mdy(startmonth, startday,startyear);
   format startdate date9.;
run;

Thanks so much!

Re: Combining date month and year into one column for date.

Barkat — Mon, 21 Aug 2023 20:38:42 GMT

Thanks for your advise. I will start a new question then.

Re: Combining date month and year into one column for date.

Barkat — Mon, 21 Aug 2023 20:57:23 GMT

It worked. I had a mistake in my code for sample data (switch StartDay and StartMontn). That is why I got missing StartDate. Thanks so much!