I'm trying to create an excel spreadsheet that allows the user to input a
number of hours worked for any given date, but for the spreadsheet to add
only the previous 28 day's worth of hours. Everything is going fine, except I
want to be able to input 1 hour 35 minutes as 1.35 and not 1:35. I found
autocorrection could automatically change the "." to a ":" so it's still
understood as a time by excel. However, adding this to autocorrection changes
my default settings across the program. Is there a way to make this file
specific, so that it affects only this file, and so that it will carry over
if another user opens the file on their computer.

Equally, if autocorrection cannot do this, is there a cell specific formula
to do this, or any other way to input the time using a full stop instead of a
colon?

Thanks,

Chris