Due Dates of Tax Returns

https://www.aicpa.org/interestareas/tax/resources/compliance/downloadabledocuments/due-dates-summary-chart.pdf

What did they do?? This is so complicated... Does anyone know of a website where you can etner the details (entity type/fiscal year end) and the system will spit out the due dates??

I would just read the instructions to the correct form.