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1 In Excel, select â File â and click Save As. 2  Choose â Tools General Options â at the bottom of the window. 3  Select the check-box for â Read-only recommended â, then select â OK 4  â. Select â Save 5  â. If prompted, choose â Yes â to update the file with the read-only setting.f you have a file that is sensitive to changes, you can force Excel 2013 or 2010 to prompt the user to open as Read Only whenever they attempt to open the file. Hereâs how to enable this setting. 1  In Excel, select â File â and click Save As. 2  Choose â Tools General Options â at the bottom of the window.
You can use Excel Worksheet formula like shown below (it reads the system time using function NOW()): =if(hour(now())>18,4,if(hour(now())>12,3,if(hour(now())>6,2,1))) If HOUR is already given in, for e.g., column A1, then use a simplified formula: