Browser Showing incorrect Time Format

I am using Brave on a German Setting windows and also with German language settings on Brave (also tested english, uk), whenever I want to schedule youtube videos I get a display of “am” and “pm”. The worse part however is that The week ends on a Saturday (Sunday being first day of the week). I am using Chrome in Parallel, same youtube account, same language setting, and there it’s different, using the 24h system and Sunday as the last day.
This already lead to incorrect schedules were videos were incorrectly published on Fr/Sa instead of the intended Sa/Su. I am not sure if there is an additional setting I am missing or this is an internal flaw.