Thank you huuthang_bd.
nubehaviour - please enter the formula below in Conditional Formatting for cell F3 to see if this is what you are after.
It should change colour when the difference between todays date and the date in E3 is a multiple of 7. And remain coloured for two days after.
If that formula works for you, let me know and I can supply the formulas for the other cells.
(A tip for testing. Replace the TODAY() references in the formula with a cell reference e.g. D3 and then type different dates in D3. It makes for easier testing rather than changing the system clock).
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