I have a spreadsheet that I created and everything is just the way I want it,
but I want to be able to lock the date field so that it can not be change by
other people.

Can anyone give me some advice on how to do this? I tried the locking cell
feature in format/cell/protection. And that works fine. But when I go to
tools/protection/protect sheet, it locks the entire spreadsheet. I just want
to lock the date cell only, and everything else can be live.