For first year applicants
From what it looks like, it should be April 1st: http://admissions.duke.edu/application/checklist
My best guess is March 23. I don’t think they’ll wait till April 1st.
the portal says by april 1
Had Duke ever released before the “by [enter date]” date?
Yes, last year, decisions came out on Thursday, March 24. Hence, the guess above of Thursday, March 23 for this year.
Two years ago (2015) RD decisions came out Thursday, March 26.
The decisions should come out on March 30th
https://today.duke.edu/2016/12/duke-accepts-861-early-decision-applicants