C# Signature:
[DllImport("coredll.dll", SetLastError=true)]
static extern bool SetSystemTime(ref SYSTEMTIME time);
VB Signature:
<DllImport("coredll.dll")> _
Private Shared Function SetSystemTime(ByRef time As SYSTEMTIME) As Boolean
End Function
User-Defined Types C#:
public struct SYSTEMTIME
{
public short year;
public short month;
public short dayOfWeek;
public short day;
public short hour;
public short minute;
public short second;
public short milliseconds;
}
User-Defined Types VB:
Private Structure SYSTEMTIME
Public Year As Short
Public Month As Short
Public DayOfWeek As Short
Public Day As Short
Public Hour As Short
Public Minute As Short
Public Second As Short
Public Milliseconds As Short
End Structure
Notes:
This function sets the system time ignoring locale settings and summer time.
To set the date and time with consideration to the locale settings use SetLocalTime.
Tips & Tricks:
Please add some!
Sample Code:
Imports System.Runtime.InteropServices
Public Class Form1
Inherits System.Windows.Forms.Form
Friend WithEvents Button1 As System.Windows.Forms.Button
Friend WithEvents MainMenu1 As System.Windows.Forms.MainMenu
#Region " Windows Form Designer generated code "
Public Sub New()
MyBase.New()
'This call is required by the Windows Form Designer.
InitializeComponent()
'Add any initialization after the InitializeComponent() call
End Sub
'Form overrides dispose to clean up the component list.
Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
MyBase.Dispose(disposing)
End Sub
'NOTE: The following procedure is required by the Windows Form Designer
'It can be modified using the Windows Form Designer.
'Do not modify it using the code editor.
Private Sub InitializeComponent()
Me.MainMenu1 = New System.Windows.Forms.MainMenu
Me.Button1 = New System.Windows.Forms.Button
'
'Button1
'
Me.Button1.Location = New System.Drawing.Point(56, 160)
Me.Button1.Size = New System.Drawing.Size(128, 64)
Me.Button1.Text = "Button1"
'
'Form1
'
Me.Controls.Add(Me.Button1)
Me.Menu = Me.MainMenu1
Me.Text = "Form1"
End Sub
#End Region
Private Structure SYSTEMTIME
Public Year As Short
Public Month As Short
Public DayOfWeek As Short
Public Day As Short
Public Hour As Short
Public Minute As Short
Public Second As Short
Public Milliseconds As Short
End Structure
<DllImport("coredll.dll")> _
Private Shared Function SetSystemTime(ByRef time As SYSTEMTIME) As Boolean
End Function
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim idag As DateTime = Now().AddHours(1).AddMinutes(2).ToUniversalTime
Dim s As New SYSTEMTIME
s.Year = idag.Year
s.Month = idag.Month
s.DayOfWeek = idag.DayOfWeek
s.Day = idag.Day
s.Hour = idag.Hour
s.Minute = idag.Minute
s.Second = idag.Second
s.Milliseconds = idag.Millisecond
SetSystemTime(s)
End Sub
End Class
C# Sample Code
using System.Runtime.InteropServices;
public class Form1 : System.Windows.Forms.Form
{
internal System.Windows.Forms.Button Button1;
internal System.Windows.Forms.MainMenu MainMenu1;
#region " Windows Form Designer generated code "
public Form1() : base()
{
//This call is required by the Windows Form Designer.
InitializeComponent();
//Add any initialization after the InitializeComponent() call
}
//Form overrides dispose to clean up the component list.
protected override void Dispose(bool disposing)
{
base.Dispose(disposing);
}
//NOTE: The following procedure is required by the Windows Form Designer
//It can be modified using the Windows Form Designer.
//Do not modify it using the code editor.
private void InitializeComponent()
{
this.MainMenu1 = new System.Windows.Forms.MainMenu();
this.Button1 = new System.Windows.Forms.Button();
//
//Button1
//
this.Button1.Location = new System.Drawing.Point(56, 160);
this.Button1.Size = new System.Drawing.Size(128, 64);
this.Button1.Text = "Button1";
//
//Form1
//
this.Controls.Add(this.Button1);
this.Menu = this.MainMenu1;
this.Text = "Form1";
}
#endregion
private struct SYSTEMTIME
{
public short Year;
public short Month;
public short DayOfWeek;
public short Day;
public short Hour;
public short Minute;
public short Second;
public short Milliseconds;
}
[DllImport("coredll.dll")]
private static extern bool SetSystemTime(ref SYSTEMTIME time);
private void Button1_Click(object sender, System.EventArgs e)
{
DateTime idag = Now().AddHours(1).AddMinutes(2).ToUniversalTime();
SYSTEMTIME s = new SYSTEMTIME();
s.Year = (short)idag.Year;
s.Month = (short)idag.Month;
s.DayOfWeek = (short)idag.DayOfWeek;
s.Day = (short)idag.Day;
s.Hour = (short)idag.Hour;
s.Minute = (short)idag.Minute;
s.Second = (short)idag.Second;
s.Milliseconds = (short)idag.Millisecond;
SetSystemTime(ref s);
}
}
Alternative Managed API:
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