public RegistryTimeZoneInformation(TimeZoneInformation tzi)
{
Bias = tzi.Bias;
StandardDate = tzi.StandardDate;
StandardBias = tzi.StandardBias;
DaylightDate = tzi.DaylightDate;
DaylightBias = tzi.DaylightBias;
}
public static void ChangeTimeZone(string newTimezone)
{
var regTimeZones = Registry.LocalMachine.OpenSubKey("SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Time Zones");
string subKey = null;
try
{
// Find Timezone in registry
subKey = regTimeZones.GetSubKeyNames().Where(s => s == newTimezone).First();
}
catch (System.InvalidOperationException)
{
// List valid available timezones for this machine if
// the timezone that was passed in was invalid.
PrintValidtimeZones();
}
var daylightName = (string)regTimeZones.OpenSubKey(subKey).GetValue("Dlt");
var standardName = (string)regTimeZones.OpenSubKey(subKey).GetValue("Std");
var tzi = (byte[])regTimeZones.OpenSubKey(subKey).GetValue("TZI");
var regTzi = new RegistryTimeZoneInformation(tzi);
var tz = new TimeZoneInformation
{
Bias = regTzi.Bias,
DaylightBias = regTzi.DaylightBias,
StandardBias = regTzi.StandardBias,
DaylightDate = regTzi.DaylightDate,
StandardDate = regTzi.StandardDate,
DaylightName = daylightName,
StandardName = standardName
};
var enablePrivilage = TokenPrivilegesAccess.EnablePrivilege("SeTimeZonePrivilege");
if (!enablePrivilage)
{
Console.WriteLine("Error: Could not enable privilege: SeTimeZonePrivilege");
Environment.Exit(1);
}
var didSet = SetTimeZoneInformation(ref tz);
var lastError = Marshal.GetLastWin32Error();
TokenPrivilegesAccess.DisablePrivilege("SeTimeZonePrivilege");
var key = Registry.LocalMachine.OpenSubKey("SYSTEM\\CurrentControlSet\\Control\\TimeZoneInformation", true);
if (key != null) key.SetValue("TimeZoneKeyName", key.GetValue("StandardName"));
if (didSet)
{
Console.WriteLine("New Time Zone:{0}", TimeZoneInfo.Local.Id );
}
else
{
switch (lastError)
{
case Program.ERROR_ACCESS_DENIED:
Console.WriteLine("Error: Access denied... Try running application as administrator.");
break;
case Program.CORSEC_E_MISSING_STRONGNAME:
Console.WriteLine("Error: Application is not signed ... Right click the project > Signing > Check 'Sign the assembly'.");
break;
default:
Console.WriteLine("Win32Error: " + lastError + "\nHRESULT: " + Marshal.GetHRForLastWin32Error());
break;
}
}
}