Custom Time Based Page Filter

Hi community!

I’m using a bar chart to track our software release cycles and each ticket has a “Release Start Date”. As the months go on, the bar chart gets larger and larger because old releases are shown. I’d like to be able to add a page filter to show “all release tickets whose Release Start Date is in this month”, or “all release tickets whose Release Start Date is in this month”. Using the default Time dimension, I think that it is actually using the “Created Date”. Does anyone know how to use a custom field date instead?

I’ve been trying various different new calculated members but can’t seem to figure it out. Thank you!