need to chanmge windows system time

[dviry]

hello ,

i need to do some things with windows system time .
the problem is that i need to change windows system time - and i dont know
how to change it .

datetime.new - can't get any parameters ..

i would like to get some help ..

thanks

[tlhintoq]

A DateTime data type is not for the System time. It can be any DateTime you might be working with: An appointment might have a DateTime. A birthday. The date and time a file was created. Etc.

The Windows SystemTime is actually a structure you set. There is no .NET Framework feature for this, so you have to do it through a WinAPI call.
A quick Google for "C# Set Windows time" got these two examples:

[StructLayout(LayoutKind.Sequential)] 
public struct SYSTEMTIME { 
 public short wYear; 
 public short wMonth; 
 public short wDayOfWeek; 
 public short wDay; 
 public short wHour; 
 public short wMinute; 
 public short wSecond; 
 public short wMilliseconds; 
 } 
 [DllImport("kernel32.dll", SetLastError=true)] 
public static extern bool SetSystemTime(ref SYSTEMTIME theDateTime );

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Windows.Forms;
using System.Runtime.InteropServices;
 
namespace Sample
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
 
        public struct SystemTime
        {
            public ushort Year;
            public ushort Month;
            public ushort DayOfWeek;
            public ushort Day;
            public ushort Hour;
            public ushort Minute;
            public ushort Second;
            public ushort Millisecond;
        };
 
        [DllImport("kernel32.dll", EntryPoint = "GetSystemTime", SetLastError = true)]
        public extern static void Win32GetSystemTime(ref SystemTime sysTime);
 
        [DllImport("kernel32.dll", EntryPoint = "SetSystemTime", SetLastError = true)]
        public extern static bool Win32SetSystemTime(ref SystemTime sysTime);
 
        private void button1_Click(object sender, EventArgs e)
        {
            // Set system date and time
            SystemTime updatedTime = new SystemTime();
            updatedTime.Year = (ushort)2008;
            updatedTime.Month = (ushort)4;
            updatedTime.Day = (ushort)23;
            // UTC time; it will be modified according to the regional settings of the target computer so the actual hour might differ
            updatedTime.Hour = (ushort)10;
            updatedTime.Minute = (ushort)0;
            updatedTime.Second = (ushort)0;
            // Call the unmanaged function that sets the new date and time instantly
            Win32SetSystemTime(ref updatedTime);
 
            // Retrieve the current system date and time
            SystemTime currTime = new SystemTime();
            Win32GetSystemTime(ref currTime);
            // You can now use the struct to retrieve the date and time
            MessageBox.Show("It's " + currTime.Hour + " o'clock. Do you know where your C# code is?");
        }
    }
}