How to group chart dates by month instead of individual dates
https://us.v-cdn.net/6031209/uploads/1MYA5BXK6DFA/image.png
This is what I have started on a dashboard. The horizontal axis are individual dates for projected project completion. I want the chart to summarize by month. I've read through a bunch of posts about creating a helper column that pull the month number, but I am not following how that will translate to the chart when we are projecting into the next year. Everything I've read seems to be overly complex compared to what I am used to. I can easily add a helper column to translate each date to say the last day of that month, but again - am I missing a simple formula for that?
Thanks