Conditional formatting if weeknum is different

[lifesafari]

Hello i like to have conditional formatting on my excel if numer of week on column G (start row 8) is different from actually week numer. 

For example today we are on weeknumer 7. 

I need to formatting and lock if numer is differet. I try this formula but not working 

=weeknumber($G8)<>weeknumber(today())

But not work. This is my sheet 

INFO	CHECK	WK
		1
		2
		3
		4
		5
		6
		7
		8
		9
		10

[#2]

@lifesafari Try this:

=G8<>WEEKNUM(TODAY())

WEEKNUMBER is not a valid Excel function!

See attached.

[#3]

@lifesafari 

Use WEEKNUM instead of weeknumber:

=WEEKNUM($G8)<>WEEKNUM(TODAY())