Timestamp - Change the timestamp in case someones modifies the cell

[Charlie Day]

I came across this post "https://chandoo.org/wp/2009/01/08/timestamps-excel-formula-help/" on chandoo. =IF(C3<>"",IF(B3="",NOW(),B3),"") is the formula Chandoo suggested and it works well except when you change the value in the cell (similar question was posted by one of the readers 'Oliver': "but I also would like to change the timestamp in case someones modifies the cell. Is that possible without VBA?"
Now this post was made on 2009 and I'm wondering if anyone was able to find a solution to this problem. Thanks