Context: I have a Google Sheets document with my daily tasks in it. Many of my tasks involve me checking to see if changes have been made to other Google Sheets (referenced in my daily task document) in the past day.
Goal: I want a function which will tell me when one of the referenced Google sheets was last altered.
Here is an example: https://docs.google.com/spreadsheets/d/1JV-ZvO1P5PPU2Eoi7qSIKaeBWgHkmAA0BLEh8OmLCGI/edit?usp=sharing
I want the function to be in the B column.