Hi @DekelE, thanks for taking the time to report this! Does code and a setting to set this already exist? Assuming there is not so I'm removing Wikimedia-Site-Requests (and the Core Platform Team as this is not maintained by them).

In T212165#4829387, @Aklapper wrote:

Hi @DekelE, thanks for taking the time to report this! Does code and a setting to set this already exist? Assuming there is not so I'm removing Wikimedia-Site-Requests (and the Core Platform Team as this is not maintained by them).

I guess it doesn't exist. Sorry for all the mess I made with the tags... I tagged what I thought was related to this request.

No problem, happy to help :)

Is there any way to solve the problem or to highlight locally saturdays?

I fear that this request will be forgotten because nobody answered for more than two weeks....

It's not lost as this is a public issue tracking system, but it's up to anyone whether anyone decides to work on this or not. See https://www.mediawiki.org/wiki/How_to_become_a_MediaWiki_hacker if you (or anyone else) is interested in working on a software change.

@DekelE, if you would like to fix it yourself, I can mentor you how to get into mediawiki, and submit a patch

I propose the following solution: to add weekday classes like sundays to all table cells. Then css styles can be easily added to every day of the week not only for sundays.

I the file CalendarTable.php, in public function buildTable() two changes should be made:

1. Adding an array at the beginning

old:

	public function buildTable() {

new

	public function buildTable() {
		$mDayStyles = array( 'mondays', 'tuesdays', 'wednesdays', 'thursdays',
			'fridays', 'saturdays', 'sundays' )

2. Code replacement

old

				if ( $i == 0 && $this->weekStart == 0 ) {
					$styles[] = 'sundays';
				} elseif ( $i == 6 && $this->weekStart == 1 ) {
					$styles[] = 'sundays';
				}

new

				$styles[] = $mDayStyles[ ( $i+6+$this->weekStart ) % 7 ]

Unfortunately I do not know how to make this changes by myself.