PROBLEM

I get all my traffic from YouTube organic and as a result a video published 6 months ago will naturally cause fewer visits to my sales funnel than one published last week - even though the one published 6 months ago may be a better converting video.

So to gauge success of a video, I need to track visits and conversions in first X days since publish (not just last X days, which is a separate measure for long-term success).

NEED

Is there a way to set the date filter to “first X days since first event with utm_content=nvideo ID] was seen”?

This way I can compare the success in a more apples-to-apples way between a video published 6 months ago vs last week.