Century interpretation for Year 2000: registry value 1UserHKCU\Software\Policies\Microsoft\Control Panel\International\Calendars\TwoDigitYearMax

Policy ID: Y2K
Scope: User Configuration
Supported on: At least Windows 2000
Source: Administrative Templates (.admx) for Windows 11 2026 Update (26H2) (version 1.0)
Category: System

Registry

1

REG_SZUser

HKCU\Software\Policies\Microsoft\Control Panel\International\Calendars\TwoDigitYearMax Current key

Enabled value: Depends on the option value
Element: Year
Value type: REG_SZ
Minimum value: 2001
Maximum value: 2099
Store as text: true

Apply with .reg · CMD · PowerShell

.reg

Windows Registry Editor Version 5.00

[HKEY_CURRENT_USER\Software\Policies\Microsoft\Control Panel\International\Calendars\TwoDigitYearMax]

; Value names and types follow the ADMX. Replace <enter value> below with your own data
"1"="<enter value>"

CMD

:: Value names and types follow the ADMX. Replace <enter value> below with your own data

reg add "HKCU\Software\Policies\Microsoft\Control Panel\International\Calendars\TwoDigitYearMax" /v "1" /t REG_SZ /d "<enter value>" /f

PowerShell

# Value names and types follow the ADMX. Replace <enter value> below with your own data

New-Item -Path 'HKCU:\Software\Policies\Microsoft\Control Panel\International\Calendars\TwoDigitYearMax' -Force | Out-Null
New-ItemProperty -Path 'HKCU:\Software\Policies\Microsoft\Control Panel\International\Calendars\TwoDigitYearMax' -Name '1' -PropertyType String -Value '<enter value>' -Force | Out-Null