public static void Set(string name)
{
var regTimeZones = Registry.LocalMachine.OpenSubKey("SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Time Zones");
var subKey = regTimeZones.GetSubKeyNames().Where(s => s == name).First();
string daylightName = (string)regTimeZones.OpenSubKey(subKey).GetValue("Dlt");
string standardName = (string)regTimeZones.OpenSubKey(subKey).GetValue("Std");
byte[] tzi = (byte[])regTimeZones.OpenSubKey(subKey).GetValue("TZI");
var regTzi = new RegistryTimeZoneInformation(tzi);
TokenPrivilegesAccess.EnablePrivilege("SeTimeZonePrivilege");
bool didSet;
if (Environment.OSVersion.Version.Major < 6)
{
var tz = new TimeZoneInformation();
tz.Bias = regTzi.Bias;
tz.DaylightBias = regTzi.DaylightBias;
tz.StandardBias = regTzi.StandardBias;
tz.DaylightDate = regTzi.DaylightDate;
tz.StandardDate = regTzi.StandardDate;
tz.DaylightName = daylightName;
tz.StandardName = standardName;
didSet = TimeZone.SetTimeZoneInformation(ref tz);
}
else
{
var tz = new DynamicTimeZoneInformation();
tz.Bias = regTzi.Bias;
tz.DaylightBias = regTzi.DaylightBias;
tz.StandardBias = regTzi.StandardBias;
tz.DaylightDate = regTzi.DaylightDate;
tz.StandardDate = regTzi.StandardDate;
tz.DaylightName = daylightName;
tz.StandardName = standardName;
tz.TimeZoneKeyName = subKey;
tz.DynamicDaylightTimeDisabled = false;
didSet = TimeZone.SetDynamicTimeZoneInformation(ref tz);
}
int lastError = Marshal.GetLastWin32Error();
TokenPrivilegesAccess.DisablePrivilege("SeTimeZonePrivilege");
if (!didSet)
{
if (lastError == TimeZone.ERROR_ACCESS_DENIED)
{
throw new SecurityException("Access denied changing System TimeZone.");
}
else if (lastError == TimeZone.CORSEC_E_MISSING_STRONGNAME)
{
throw new SystemException("Application is not signed.");
}
else
{
throw new SystemException("Win32Error: " + lastError + "\nHRESULT: " + Marshal.GetHRForLastWin32Error());
}
}
}
private static extern bool SetDynamicTimeZoneInformation([In] ref DynamicTimeZoneInformation lpTimeZoneInformation);
