Hi to everyone

I have one file with 3 pages. The 3 pages have the same content. I want to
create a macro which automatically one time every day (when the day changes)
will delete certain cells (for example: C10, C11, C12) in each page.
Also this macro will add the number:1 in certain cells (for example: D10,
D11, D12) in each page.
NOTICE: The above macro will be activated automatically (when the file
opened) one time a day (when the day changes).
Thanks in advance.

Spiros