Could you please attach a sample report or mockup of the desired report output ?
It's probably important to keep in mind something: OBIEE will never "generate" by itself something (dataset rows with your dates) if you don't feed it with that data in a way or another.
So if you always have 14 days between the 2 dates just write 14 times the formula adding 1, 2, 3 etc. days.
And +1 for Ebin : show us something (but don't attach a .docx file!) because it's just impossible to imagine what you really expect as output ...
It would be good if you provide sample data.
I dont think I got it correctly but I want thought some light
timestampadd(SQL_TSI_DAY,rsum(14),Time.Date) this would give date for every 14 days.