macro code for protected and shared worksheet

I have a protected and shared worksheet sheet with 3 user access, 2 users has their own password to work in their selected ranges and one user range is without password, reset of the sheet is protected for all.
I am using macro for timestamp, but when macro unprotect the sheet, it goes open for other user too and also when macro protect the sheet Allow user to edit the range doesn’t apply.
I just copied the code coz I don’t know vba, below is the code anyone please help me to resolve this issue.

Please Login or Register  to view this content.

Moderator Note:

Pls add code tags around your code as per forum rule#3.

I could be wrong, but I beleive Macros will not work on a shared workbook.