Adding Months to a Date

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Adding Months to a Date

This is probably an easy answer, but how does one add months to a date variable.

 

Example:

 

suppose date_start='01Aug2015'd and I use this as the ending point for my historical data. When I build my model and use the lead=12 option for my arima forecast, I'd like to be able to use that 12 in the lead statement to autiomatically calculate a bound for using the band command to shade in the forecast area in sgplot.

 

So I need to be able to take that 12 and add it to date_start. I don't seem to be able to use:

 

date_end=date_start + 12,

 

So how can I add twelve months to date_start? I actually have a variable called lead_var that passes the lead value so I can change it in one place as a global variable and it will affect all arima calls. So in effect I need to be able to use:

 

date_end=date_start + lead_var

 

with lead_var=12 in this case.

 

Thanks again for all your help. These forums are amazing!

-Bill


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Solution
‎06-12-2017 10:35 AM
PROC Star
Posts: 7,363

Re: Adding Months to a Date

data have;
  input date date9.;
  format date date9.;
  cards;
2feb2017
3apr2016
;
data want;
  set have;
  format newdate date9.;
  newdate=intnx('month',date,12,'s');
run;

Art, CEO, AnalystFinder.com

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Solution
‎06-12-2017 10:35 AM
PROC Star
Posts: 7,363

Re: Adding Months to a Date

data have;
  input date date9.;
  format date date9.;
  cards;
2feb2017
3apr2016
;
data want;
  set have;
  format newdate date9.;
  newdate=intnx('month',date,12,'s');
run;

Art, CEO, AnalystFinder.com

Contributor
Posts: 27

Re: Adding Months to a Date

thank you!

 

This worked perfectly

☑ This topic is SOLVED.

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