How to collapse records with consecutive dates

[nisha_a]

I have records as follows:

Subject startdt. enddt dur
01 01jan2019 01jan2019 1
01 02jan2019 02jan2019 1
01 03jan2019 03jan2019 1
01 05jan2019 05jan2019 1

I want the records with consecutive dates, that is from 1jan to 3jan be collapsed as 1 record and the dur value should be 3. Also the 5jan record should be left as is Because the date is not a consecutive date.

[PaigeMiller]

A couple of questions:

• does subject play any role in the calculations or analysis? If so, how?
• can start date and end date be different?

If you answer YES to any of these, can you provide a more realistic example of the data?

Also: when you say "Because the date is not a consecutive date" what date are you referring to, start date or enddate? 

Also: can you please provide working SAS code to read in your example data into a SAS data set?