Macro: Add Todays Date if 4 columns maintain value (Any value)

I am working on creating a structure that if a row has values in columns Q,R,S,T then column U would be populated with the date that the row meet this status (i.e. Todays Date).

The problem I am struggling with is that the "Values" in these cells are not anything specific could be dates and or text. I am not certain to say "If a cell contains value" I guess is what I am struggling with. If it was a specific value then I am certain I could figure it out but this is a new case for me.

Any help would be appreciated thanks.