Quick fix: Open Settings → Time & language → Date & time → Additional clocks. Tick Show this clock for clock 1 and clock 2, pick the time zone, give each a label (e.g., “NYC,” “London”). Click into the system tray clock — the other two zones now appear in the calendar/clock flyout.

You work with team members in other time zones. Constant Google searches for “what time is it in Tokyo” waste minutes per day. Windows has built-in support for up to two additional clocks visible in the system tray clock flyout. Setup takes 3 minutes.

Symptom: Want quick access to current time in two other time zones (e.g., HQ, remote team, family abroad).
Affects: Windows 11 (and Windows 10) with system tray clock.
Fix time: ~5 minutes.

What causes this

Windows’s system clock tracks only one zone (the one you set in Date & time). But the clock flyout (the panel that opens when you click the tray clock) can show two additional clocks: each pinned to a different time zone and labeled with a custom name. The setting is buried under Additional clocks, which is easy to miss.

Windows 11 has a known limitation: clicking the tray clock in some builds opens the Notifications/Calendar split flyout without the additional clocks visible. The fix is a single registry value that forces the legacy flyout behavior.

Method 1: Add two additional clocks via Settings

The standard route.

Open Settings → Time & language → Date & time.
Scroll down. Click Additional clocks. (May also be labeled Add clocks for different time zones.)
The Date and Time dialog opens on its Additional Clocks tab.
Tick Show this clock for Clock 1. Pick a time zone from the dropdown (e.g., (UTC-05:00) Eastern Time (US & Canada)).
Enter a display name in the box (e.g., NYC). Keep names short — they appear next to the time in the flyout.
Repeat for Clock 2 with a second time zone.
Click Apply → OK.
Test: hover over (Windows 10) or click (Windows 11) the system tray clock. The flyout should show your local time at the top and the two additional clocks below.

Setup takes 3 minutes. The additional clocks update in real time and follow DST changes automatically.

Method 2: Restore the legacy clock flyout if additional clocks don’t show

For Windows 11 builds where clicking the clock opens the Notifications panel without the additional clocks.

Press Win + R, type regedit, press Enter.
Navigate to HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\ImmersiveShell.
Find or create DWORD value UseWin32TrayClockExperience.
Set to 1.
Close Registry Editor. Sign out and back in (or restart Explorer via Task Manager).
Click the system tray clock. The legacy flyout appears with calendar on top and the additional clocks visible.
To revert: set UseWin32TrayClockExperience back to 0 or delete the value.

This is the workaround for the Windows 11 redesign of the clock area. As of 22H2, this registry tweak restores the time-zone display.

Method 3: Use a third-party app for more than two clocks

Windows’s built-in feature caps at two additional clocks. For more, use a dedicated app.

Download T-Clock Redux from GitHub (free, open source). Replaces the system tray clock with a more configurable one.
Or use EarthTime by Des Pering (paid but inexpensive, free trial). Adds a desktop widget showing multiple time zones with map.
Or use a Windows widget: Windows 11 has built-in widgets. Click the weather icon (or Win + W) to open the widget panel. Click Add widgets and add the World clock widget if available.
For workflows that integrate with Outlook/Teams: use Outlook calendar’s built-in time zone support — in Outlook → File → Options → Calendar → Time zones, you can show two time zone labels next to the appointment grid.
For developers and ops users: install WorldClock from Microsoft Store. Free, supports unlimited zones, has command palette for quick lookup.

This is the right path if you regularly need more than two zones (international consulting, distributed teams across 4+ regions).

How to verify the fix worked

Click the system tray clock. The flyout shows your local time prominently, with the two additional clocks beneath, each with the label you entered.
Hover over (Windows 10) the clock. A tooltip appears showing all three times.
Check the times match: open a known-good source like worldtimebuddy.com or time.is for each zone. Windows’s times should match exactly.

If none of these work

If clocks don’t show in the flyout despite being enabled in Settings, the system tray flyout is corrupted. Restart Explorer: Ctrl + Shift + Esc → right-click Windows Explorer → Restart. Then test the clock flyout. Check time zone setting is correct: incorrect base time zone causes the additional clocks to show wrong times. Settings → Time & language → Date & time → Time zone should match where you actually are. Re-register the clock’s tile: open services.msc → verify Windows Time is Running and StartType is Automatic. Restart it. Use Task Scheduler workaround for full custom clocks: create scheduled tasks that send notifications at specific times in remote zones, e.g., “Tokyo morning” alert at 8 AM Tokyo time. This isn’t a clock per se but solves the underlying problem of “know when it’s time-X in zone-Y.” For 2-in-1 tablets where the system tray is unreliable: Live Tiles in the old Start menu (Windows 10) or pinned widgets (Windows 11) show world time more reliably.

Bottom line: Settings → Time & language → Additional clocks pins two extra zones to the system tray clock flyout. Five minutes of setup eliminates daily time-zone math.