Hello all, I illustrated my question in the following example. Could you please help me to generate the desired output in SAS ? Basically, we would like to expand the service period and ignore any gaps within 30 days. ID     FROM_DT     THRU_DT 10     02/03/2014     02/25/2014 10     03/01/2014     04/02/2014 10     04/03/2014     05/05/2014 10     07/07/2014     07/30/2014 10     08/20/2014     08/25/2014 11     03/02/2013     05/03/2013 11     05/08/2013     05/20/2013 Desired output should look like this: ID     FROM_DT     THRU_DT 10     02/03/2014     05/05/2014 10     07/07/2014     08/25/2014 11     03/02/2013     05/20/2013 Thank you very much! ... View more