I came across this issue today as well, in the end creating a NOW() field adjusted to my timezone, and comparing to (in my case) a last modified field also adjusted to my timezone, and used the IS_SAME function restricted to 'day' appeared to work be...
Agreed, this would be a great feature. I am new to these boards, but trying to find answers to specific questions I would also agree that it appears Airtable never reads these boards, and certainly never actions anything.