Setting Date and Time on Windows Embedded Standard 7 OS

Question

I am working on setting Date and Time on Windows Embedded Standard 7 OS using C# .net.

I tried changing the system date using code in following link.

http://www.pinvoke.net/default.aspx/kernel32.setsystemtime

But I also saw that one should get the privileges to change the same. But I am receiving an error. here is the code to

Privileges.EnablePrivilege(SecurityEntity.SE_SYSTEMTIME_NAME);

        if (SetSystemTime(ref st) == 0)
        {
            return 0;
        }
        return 1;

For getting the privaleges I used the code from the following link.

http://www.pinvoke.net/default.aspx/advapi32/AdjustTokenPrivileges.html C# Sample Code 2 (With full error handling):

I have question: Is it possible to change the Date and Time using PInvoke. If it is possible what are the change/Setting I should do at the OS.

And what are the other ways to change the date and time.

thank you

Edit:

[DllImport("kernel32.dll")]
    extern static uint SetSystemTime(ref SYSTEMTIME lpSystemTime);


    public int SetSystemDateTime(DateTime NewSystemDateTime)
    {
        SYSTEMTIME st = new SYSTEMTIME();
        st.wYear = (ushort)NewSystemDateTime.Year;
        st.wMonth = (ushort)NewSystemDateTime.Month;
        st.wDay = (ushort)NewSystemDateTime.Day;
        st.wHour = (ushort)NewSystemDateTime.Hour;
        st.wMinute = (ushort)NewSystemDateTime.Minute;
        st.wMilliseconds = (ushort)NewSystemDateTime.Millisecond;

        Privileges.EnablePrivilege(SecurityEntity.SE_SYSTEMTIME_NAME);

        if (SetSystemTime(ref st) == 0)
        {
            return 0;
        }
        return 1;

    }

Answer 1

I finally found the solution. Code in the following link works fine for me: http://www.pinvoke.net/default.aspx/kernel32/SetLocalTime.html

Also following code I found in one of the posts in stackoverflow, helped me.

using System.Security.Principal;
    bool IsUserAdministrator()
     {             
        bool isAdmin;
        try
        {
            WindowsIdentity user = WindowsIdentity.GetCurrent();
            WindowsPrincipal principal = new WindowsPrincipal(user);
            isAdmin = principal.IsInRole(WindowsBuiltInRole.Administrator);
        }
        catch (UnauthorizedAccessException ex)
        {
            isAdmin = false;
        }
        catch (Exception ex)
        {
            isAdmin = false;
        }
        return isAdmin;
    }

Answer 2

Ok I did some research and I tried few things. You need admin permissions to change system date and time, one solution is to add

 <requestedExecutionLevel level="requireAdministrator" uiAccess="false" />

to application manifest file, this way the application will always ask user for permissions.

On code project there is an article that maybe able to help ypu without adding manifest file.

http://www.codeproject.com/Articles/125810/A-complete-Impersonation-Demo-in-C-NET