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Date logic

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Contributor
Posts: 66
Accepted Solution

Date logic

Hi,

I have a statement end date that I need to figure the statement start date, which is exactly the same day but in the month previous.

for example

id bill_end_date bill_st_date

1 12Jan2011 12Dec2010

2 23Feb2011 23Jan2011

etc.

thanks for your help.


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‎02-01-2012 01:25 PM
Respected Advisor
Posts: 3,156

Date logic

Posted in reply to Danglytics

Something like this may get your started:

data have;

infile cards;

format bill_end_date date9.

       bill_st_date date9.;

input id bill_end_date : date9.;

bill_st_date=intnx('mon', bill_end_date,-1,'sameday');

cards;

1 12Jan2011

2 23Feb2011

;

proc print;run;

Kindly Regards,

Haikuo

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Super User
Posts: 19,815

Date logic

Posted in reply to Danglytics

intnx function with the same option.

Check the docs.

Solution
‎02-01-2012 01:25 PM
Respected Advisor
Posts: 3,156

Date logic

Posted in reply to Danglytics

Something like this may get your started:

data have;

infile cards;

format bill_end_date date9.

       bill_st_date date9.;

input id bill_end_date : date9.;

bill_st_date=intnx('mon', bill_end_date,-1,'sameday');

cards;

1 12Jan2011

2 23Feb2011

;

proc print;run;

Kindly Regards,

Haikuo

Contributor
Posts: 66

Date logic

thank you for your help.

what happens to months with 31 days? I assume it goes to month end?

Respected Advisor
Posts: 3,156

Date logic

Posted in reply to Danglytics

Bingo! It will go to the last day of the month. Try it for yourself, change 12Jan2011 to 31Mar2011, and see what happens.

Regards,

Haikuo

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