If I understand what you want, and that cells have the date value in them.
See if this is what you are trying to do?
In Cell A1 put =now()
in Cell A2 put =a1+1
Copy A2 to A3:A33
Highlight Range A1:A33
Format/Conditional/Condition
Select Formula is 
Enter Formula WEEKDAY($A1)=1
I added a new style GrayBold that set font to bold, and background to 
gray4
Than OK.


On 18 Nov 2020 at 18:40, . wrote:

From:                   "." <[email protected]>
Subject:                [libreoffice-users] Easily format cells to bold and a 
certain background color
To:                     [email protected]
Date sent:              Wed, 18 Nov 2020 18:40:04 -0500

> 
> 
> I
>           record the weather for each day of the year....it's a hobby.
> 
> 
> It
>           would be simplest if Calc could format each Sunday in bold
>           font and a gray background.  With many Sundays in a year it
>           takes too long to manually change each year's Sundays.
> 
> 
> I have
>           sample Calc sheet I use but don't know where I can upload it
>           so you can take a look at it.
> 
> 
> 
> 
> Thanks,
> 
> 
> 
> 
> Peter
>           Dutton
> 
> 
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 Guam - Where America's Day Begins                        
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