Windows carries two extra clocks next to the system time, useful for a team in another zone or for a client abroad. The setting lives in the old date and time applet and survives reboots.
Open **timedate.cpl**, go to **Additional Clocks**, tick two entries with a display name, then hover the taskbar clock. The values are stored per user in the registry.
Settings shows the time zone but not the extra clocks. **timedate.cpl** is the applet with the Additional Clocks tab, and it still works on Windows 11.
timedate.cpl
Get-TimeZone | Select-Object Id,DisplayName,BaseUtcOffset
Get-DateWindows allows exactly two additional clocks. Each needs a tick, a zone and a display name, which is the label shown in the hover popup.
# Additional Clocks tab
# tick 'Show this clock', pick the zone, set the display name
# repeat for the second clock, then Apply
Get-TimeZone -ListAvailable | Where-Object DisplayName -like '*Tokyo*'Hovering the clock shows the extra times under the date. The same values are readable from the registry, which is the faster way to confirm the setting took.
$k = 'HKCU:\Control Panel\International\User Profile'
Get-ItemProperty $k | Select-Object Clock1,Clock2
Get-ItemPropertyValue $k -Name 'Clock1' -ErrorAction SilentlyContinueThe values are two strings under one registry key. Copying them is faster than clicking through the applet on a new PC.
$src = Get-ItemProperty 'HKCU:\Control Panel\International\User Profile'
Set-ItemProperty 'HKCU:\Control Panel\International\User Profile' -Name Clock1 -Value $src.Clock1
Get-ItemProperty 'HKCU:\Control Panel\International\User Profile' | Select-Object Clock1,Clock2An extra clock follows the zone you pick, not the system zone. If the time is off by a whole hour, the zone is wrong; if it is off by minutes, the system clock is drifting.
Set-TimeZone -Id 'W. Europe Standard Time'
w32tm /resync
Get-TimeZone | Select-Object Id,BaseUtcOffsetThe taskbar format comes from the regional settings, not from the extra clocks. A registry value adds seconds, and the short time pattern decides 24-hour display.
reg add "HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced" /v ShowSecondsInSystemClock /t REG_DWORD /d 1 /f
taskkill /f /im explorer.exe
start explorer.exeNo additional clock is ticked. Open timedate.cpl and check the Show this clock box for at least one entry.
The zone was picked from a similar name. Compare the BaseUtcOffset from Get-TimeZone -ListAvailable with the offset you expect.
The registry key is per user. A different account has its own clocks, and a roaming profile can overwrite the value at logon.
Feature updates sometimes reset Explorer settings. Write the ShowSecondsInSystemClock value again and restart Explorer.
Not with the built-in applet. A widget or the clock app covers more zones, but the taskbar hover stays at two.
Yes, they follow the system time and the chosen zone. Daylight saving is handled by the zone data.
No. It only adds labels to the popup; the machine keeps its own zone.
Open timedate.cpl, clear both Show this clock boxes, and apply. Delete the ShowSecondsInSystemClock value if you added it.
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