Index / Match - Min Date

Hi There !

New to the forum, but I've been looking at different forum threads in the past. It's my first post and I was hoping someone had some insight into a problem I have with a match index array formula.

My requirement is to have a dynamic formula that pulls back the minimum date based on a category. I am looking to run some statistics for a set of webinars that people respond to within 24 hours or more. I am trying to pull the first / min date of the webinar based on the webinar.

For example if I have 40 responses for a webinar ranging from 07/27/2017 to 08/03/2017. I am trying to return 07/27/2017 for each of the 40 responses on that webinar.

I have created an array formula that provides me with the Unique webinars that are entered into the sheet.

=IFERROR(INDEX(Webinars, MATCH(0,COUNTIF($N$1:N1, Webinars), 0)),"ERROR") -- Webinars is the range named for $B$1:$B$3000

From there I have extracted the date and time from the survey time column and have worked towards 'Date of Webinar' formula.

In an attempt to break it down, I have started a sub section starting in column P with sample data that I tried to mirror the full data set.

This is the current formula that I was able to come up with. It works for some scenarios but not all.

=INDEX($T$5:$T$14,MATCH(W5,$S$5:$S$14,0),MATCH($P$5:P5,$P$5:$P$14,0))