I had such high hopes. The interface and functionality suggests this Gantt Chart add-on could work for my purposes. However, it won't allow me to start a project prior to today's date. I actually need to re-create a timeline since 2016 (four years ago) up to today 2020. Unfortunately, when I entered a start time for September 16, 2016, it generated a system error - said that the start date of the event precedes the start date of the project. It recommended that I use the sidebar menu setting to enter a project start date before my task. However, the sidebar setting will only let me enter a 2020 month, day, and year. It will not allow me to enter a September 16, 2016. Please advise.