⚠️Microsoft has added Clock to the secondary displays in Windows 11, so this article is no longer relevant. If you do not see Clock, make sure you have Build 22000.527 installed at least⚠️(Reference)
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One of the main talking points about Windows 11 is the redesigned Taskbar, written from scratch in the modern design language. As it was written from scratch, some features are missing in Windows 11 taskbar compared to Windows 10, like drag and drop items between applications, no clock on the Second display, smaller Taskbar, etc(details here).
This article explains how to add Clock on the secondary display in the Taskbar using a small utility called ElevenClock, from Github.
ElevenClock showing display on Second display on 125 percent scaling
Add Clock to the secondary Taskbar in Windows 11
Although the feature may be returning in the future in WIndows 11 through feature updates, the initial 21H2 release of Windows 11 does not support Clock on the Secondary displays. Courtesy of ElevenClock at GitHub, you can also show the clock on the other screens.
How to Run ElevenClock
To Run ElevenClock, download the program from the releases page:
https://github.com/martinet101/ElevenClock/releases
The installation is quite simple, and when done, it runs in the background without user intervention.
The developer has listed its features below:
It supports all system locales and time formats (they are pulled from the OS)*
It shows in all displays except in the primary one (Because you have the default system clock)
It supports dark and light theme
It has a hide button to prevent annoying on full-screen
It imitates Windows 11's taskbar clock animation on hover
It supports taskbars on the top of the screen
It supports seconds enabling via locale or regedit (windows 11's default clock can't do that)
ElevenClock downloads and installs updates automatically, so you don't have to
Clicking the clock shows/hides the notifications and calendar panel
Correct alignment and size on HiDPi displays (100%, 200%, 300%) AND on fractional HiDPI displays(125%, 150%, 175%, 250%, etc.)*
Correct alignment and size on Different-scaled monitors (Display1: 100%, Display2: 150%, Display3: 225%, etc.)*
The clock updates the time each second, so you won't see different times across all your taskbars
The clock also adjusts itself automatically when (dis)connecting monitors
Automatically starts at login
Known issues and submit a bug report
You can always reach out to the developer for any issues you may encounter.
Issues · martinet101/ElevenClock (github.com)