Disable Automatic Daylight Savings Adjustment (Windows NT/2000/XP)

Windows will normally attempt to automatically adjust the system clock for daylight saving changes based on the computer timezone. This tweak allows you to disable the automatic adjustment.

This tweak can be easily applied using WinGuides Tweak Manager. Download a free trial now!

Open your registry and find or create the key below.

Create a new DWORD value, or modify the existing value, called "DisableAutoDaylightTimeSet" and set it according to the value data below.

Exit your registry; you may need to restart or log out of Windows for the change to take effect.

		(Default)	REG_SZ	(value not set)
		DisableAutoDaylightTimeSet	REG_DWORD	0x00000001 (1)

	HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\TimeZone...

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Disclaimer: Modifying the registry can cause serious problems that may require you to reinstall your operating system. We cannot guarantee that problems resulting from modifications to the registry can be solved. Use the information provided at your own risk.