Gotta tell you that this is not reliable and might break with iOS. Nowadays I stay away from this, it caused me too much trouble in the past. Glide’s underlying date/time format combined with Luxon was not friendly for Safari, and it almost always returned “invalid” for me.
I would just convert it to a numerical column, I believe Bob had the same method in his video. I usually do YYYYMMDD so my formula is:
YEAR(D)*10000 + MONTH(D) * 100 + DAY(D)
With D being the timestamp in question.