Using a formula column that results in a date, that can be used in a gantt chart

I created a Formula column. The formula I used is an IF statement that returns a date if true. The issue I’m having is that, when I go to the Gantt chart view, my Formula column does not appear in the choices of “Choose timeline columns”. Is there something I’m missing? Thanks!

I posted the original question a couple days ago. Is there a moderator that can answer?

I could not agree more! I’m not sure why this function has not been added, nor do I understand how no moderator has replied regarding this potential upgrade, in almost a year.

It was a bit of a task to force that formula column to show as a date (which I figure would be easier if we had a ‘format column’ option), but now that it’s showing the date, it’s useless until I can use this data for a gantt chart.