As of 2020-01-22, the service that had been provided at earningscalendar.net is no longer free. Please see zacks-estimates-financial-statements for another earnings calendar ETL program.
These Racket programs will download earnings calendar JSON documents from https://earningscalendar.net and insert the data into a PostgreSQL database. The intended usage is:
$ racket extract.rkt
$ racket transform-load.rkt
The provided schema.sql file shows the expected schema within the target PostgreSQL instance. This process assumes you can write to a /var/tmp/ecnet/earnings-calendar folder. This process also assumes you have loaded your database with the NASDAQ symbol file information. This data is provided by the nasdaq-symbols project.
It is recommended that you start with the standard Racket distribution. With that, you will need to install the following packages:
$ raco pkg install --skip-installed gregor tasks threading