I am trying to get the quarterly earning dates for some stocks, using Fundamentals dataset. I also tried the MorningStart dataset to get the file_date. I am assuming file_date is the earning date. However, when I try to get the unique earning dates for a year timespan, I only see the 3 earning dates. The annual earning date is not included in fundamental dataset file_date. Attached is the notebook for the reference.
I am looking for a free dataset which can help me. Please provide an example if you can.