Usage (Free) Usage is a menu bar app that comes with cool customizable popover widgets and advanced features to track your system’s performance, processor, disk usage, network activity, and memory pressure among others. (I personally haven't used it but I heard it's good). Source: over 1 year ago

I use dark mode, but there are some apps which are (IMO) just plain ugly in dark, like the calendar and mail. You could use an app like NightOwl. But there is a command for that. It's got two steps, firstly find the app's bundle id, using osascript -e 'id of app "App_Name"'. Then pass this result into: defaults write NSRequiresAquaSystemAppearance -bool Yes. Source: almost 2 years ago

I had this issue a lot - instead of relying on the auto mode I went ahead and installed NightOwl. Now the theme changes correctly at the appropriate time. Source: about 2 years ago

Sadly, this functionality isn't built-in to Windows and (unlike macOS) there doesn't appear to be any decent third-party utilities to sort this out for you. To date, I've been using an Open-Source offering named Luna. Source: over 2 years ago

For changes at exact times, use a third party util like NightOwl. Source: almost 3 years ago

I just gave up with the default Mac settings downloaded NightOwl. Night Shift works as normal but NightOwl ensures that dark mode turns on at sundown. Source: almost 3 years ago