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how to add to sas date

Posted on 2011-02-18
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Trying to add a value to a sas date in a sql query
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Question by:eelaprade
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LVL 14

Expert Comment

by:Aloysius Low
ID: 34925919
if you are looking to doing something simple like adding or reducing the number of days, just perform it like a normal numerical addition or subtraction

otherwise, there's the INTNX function you can make use of

what exactly are you trying to do?
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Author Comment

by:eelaprade
ID: 34926018
Hi-
I am using the SAS v8
I want to know if I can use poc SQL for date additions i.e. I want to add 365 days to a start date and creat a enddate.  Can I use the normal formart MMDDYYYY + 365 and get the last date as MMDDYYYY?
How would a program for this look like?

Please advise
Thanks

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LVL 14

Expert Comment

by:Aloysius Low
ID: 34926129
it doesn't matter what the format of the date is as long as the value you are trying to add is a date field.

e.g.
data work.test_date;
  format date_value end_date date9.;
  date_value = '01jan2011'd;
  end_date = date_value + 365;
run;
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Accepted Solution

by:
Aloysius Low earned 800 total points
ID: 34926148
forgot to add the proc sql part:

proc sql;
  create table new_date as
    select *, (date_value + 365) as end_date_sql format date9.
    from test_date;
quit;

you'll see that in new_date table, end_date_sql and end_date has the same value :)
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Assisted Solution

by:d507201
d507201 earned 1200 total points
ID: 34927240
SAS dates are stored as numbers--the number of days before or after January 1, 1960.  So you can add and subtract numbers of days from them.  If you're going to be working a lot with dates then you should learn to use the INTNX function that Iowaloysius suggests and the INTCK function because they are much more powerful than just adding and subtracting days.  Also, there are some great SAS Conference papers about date handling.  Go to http://www.lexjansen.com/sugi/ and search for 'date handling'.
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