Adding Months to a Date

[BCNAV]

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

[art297 · Accepted solution]

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

[BCNAV]

thank you!

This worked perfectly