Assuming your spreadsheet will be password protected with all cells
hidden......I always insert a column on the left, insert the formula
'=today()' then identify a cell which drives much of the information
and add the fomula =if('the cell with =today() in it''the date in
numbers you want the sheet to stop working',"")

i.e. if today's date is greater than the preset date for the sheet to
cease functioning then return blank data in the cell in which the
formula appears.



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