Thanks for filing this @Od1n. Do you plan to work on this?

Here is an extract of the markup in History and User contributions pages:

section.mw-pager-body
    ul.mw-contributions-list
        li[.unrelated-classes]
            span.mw-changeslist-time (text content: 14:15) [hidden]
            a.mw-changeslist-date (text content: 14:15, 14 March 2022)

and in Watchlist page:

div.mw-changeslist
    ul.special
        li.mw-changeslist-line
            span.mw-changeslist-line-inner
                span.mw-changeslist-date.mw-changeslist-time (text content: 14:15)

Therefore, I could figure out two solutions:

Solution A:

.mw-contributions-list .mw-changeslist-time {
  display: none;
}

Solution B:

.mw-changeslist-time:not(.mw-changeslist-date) {
  display: none;
}

I would pick solution B:

• Solution A should be less robust. For example, it would fail if some script (or new MediaWiki feature) groups the contributions by day, like in the watchlist, in the process changing the lines to use the same markup.
• Solution B sounds appropriate:
  • mw-changeslist-date is a general-purpose class, that can contain various contents. What it is asked for, is to be present once per line.
  • mw-changeslist-time is a more specific class, that just means "the content is a time".
  • see the code comments here: https://gerrit.wikimedia.org/g/mediawiki/core/+/87d9978e8949dc1564aba6dba6b7b893317a78de/includes/changes/ChangesList.php#648

Change 772825 had a related patch set uploaded (by Gerrit Patch Uploader; author: Jean Culefort):

[mediawiki/core@master] Do not hide the "time" element if it also carries the "date" role

https://gerrit.wikimedia.org/r/772825

Note that this seemingly-unused always-hidden "time" element was created via T298639. It is planned to be used once T293268 is finished.

Thanks for the patch @Od1n! (I assume that's you) Your explanation makes perfect sense.

Change 772825 merged by jenkins-bot:

[mediawiki/core@master] Do not hide the "time" element if it also carries the "date" role

https://gerrit.wikimedia.org/r/772825