I am updating an exisitng Excel sheet used for timesheet and I need to embed
logic in the sheet that will prohibt the entry of time on non-work days in a
period. For example, I want the person completing the sheet to only be able
to add hour worked time on m-f days and not the weekend. I looked in the
templates even for biweekly sheets, it always assumes that the period starts
on a Monday.

Please provide insight.