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.
=OR(MOD(TODAY()-E3,7)=0,MOD(TODAY()-E3-1,7)=0,MOD(TODAY()-E3-2,7)=0)
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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