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Using conditional formatting ( Custom formula )
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I'm trying to improve my diabetic records sheet.
Is it possible to use conditional formatting ( Custom formula ) to highlight only the first instance of a day, in the B column.



Thanks in advance.
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may be a formula to do this in one hit

if not - use this say in H2
=Arrayformula(iferror(SORT(ROW(B$2:B),SORT(ROW(B$2:B),B$2:B,1),1)-MATCH(B$2:B,SORT(B$2:B),0)-ROW()+2))
in a spare column - gets you the first instances

then use example    =$H2=1
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I added your arrayformula to H2 which gave me
The whole of the H column with 1

then applied =$H2=1 to I2, I3 etc.... which gave me TRUE
 
Am I supposed to get FALSE  ( all TRUE ) to add conditional formatting ?
So not sure how this will work, Am I be stupid ?

Found out why 
Each cell in the B column has unique content :-
e.g. 
5/26/2019 6:51:30
5/26/2019 9:09:27 

only displayed as:-
Sun 25-05-19
Sun 25-05-19
only the displayed result match
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pls - ALWAYS supply an editable google sheet - images are not workable
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Your right he's a copy to look at.

You have to wait a little as a script jumps to the first editable cell.
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Forum volunteer, not Google employee
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I'm glad it sounds like it may work out for you. Let us know if there is another hitch somewhere. 
 
Thank you, Thomas, for bringing this one back up. 
 
Have a great weekend!
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