I noticed that Leaderboard doesn't change after midnight but rather after 1 am. I refreshed the page before and after taking this screenshot:
Also I think this issue is limited to the leaderboard since weekly progress is registering that it's past midnight.
While there are many things that we try to localize for user experience, the leaderboard is one thing that we do not localize. The cutoff for midnight for the leaderboard is the exact same time for all users. Your view of the leaderboard changes at 1 am because your timezone is set to +1, Europe/Amsterdam.