详解如何利用C#实现设置系统时间

实践过程

效果

代码

public partial class Form1 : Form
{
   public Form1()
   {
       InitializeComponent();
   }
   //api函数声明  
   [DllImport("kernel32.dll", CharSet = CharSet.Ansi)]
   public extern static bool SetSystemTime(ref SYSTEMTIME time);
   [StructLayout(LayoutKind.Sequential)]
   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 Miliseconds;
   }
   private void timer1_Tick(object sender, EventArgs e)
   {
       lblNowTime.Text = DateTime.Now.ToString();
   }

private void Form1_Load(object sender, EventArgs e)
   {
       lblNowTime.Text = DateTime.Now.ToString();
       Microsoft.Win32.SystemEvents.TimeChanged+=new EventHandler(SystemEvents_TimeChanged);
   }

private void SystemEvents_TimeChanged(object sender, EventArgs e)
   {
       MessageBox.Show("系统日期修改成功！","提示",MessageBoxButtons.OK,MessageBoxIcon.Information);
   }

private void button1_Click(object sender, EventArgs e)
   {
       mYear = monthCalendar1.SelectionRange.Start.Year;
       mMonth = monthCalendar1.SelectionRange.Start.Month;
       mDay = monthCalendar1.SelectionRange.Start.Day;
       //调用代码  
       SYSTEMTIME t = new SYSTEMTIME();
       t.Year = (short)mYear;
       t.Month = (short)mMonth;
       t.Day = (short)mDay;
       t.Hour = (short)(dateTimePicker1.Value.Hour - 8);//这个函数使用的是0时区的时间,例如，要设12点，则为12-8  
       t.Minute = (short)dateTimePicker1.Value.Minute;
       t.Second = (short)dateTimePicker1.Value.Second;
       bool v = SetSystemTime(ref t);  
   }
   int mYear;
   int mDay;
   int mMonth;
   private void monthCalendar1_DateSelected(object sender, DateRangeEventArgs e)
   {
       mYear = e.Start.Year;
       mMonth = e.Start.Month;
       mDay =e.Start.Day;
   }

private void button2_Click(object sender, EventArgs e)
   {
       Application.Exit();
   }

}

partial class Form1
{
   /// <summary>
   /// 必需的设计器变量。
   /// </summary>
   private System.ComponentModel.IContainer components = null;

/// <summary>
   /// 清理所有正在使用的资源。
   /// </summary>
   /// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>
   protected override void Dispose(bool disposing)
   {
       if (disposing && (components != null))
       {
           components.Dispose();
       }
       base.Dispose(disposing);
   }

#region Windows 窗体设计器生成的代码

/// <summary>
   /// 设计器支持所需的方法 - 不要
   /// 使用代码编辑器修改此方法的内容。
   /// </summary>
   private void InitializeComponent()
   {
       this.components = new System.ComponentModel.Container();
       this.monthCalendar1 = new System.Windows.Forms.MonthCalendar();
       this.tabControl1 = new System.Windows.Forms.TabControl();
       this.tabPage1 = new System.Windows.Forms.TabPage();
       this.button2 = new System.Windows.Forms.Button();
       this.button1 = new System.Windows.Forms.Button();
       this.groupBox2 = new System.Windows.Forms.GroupBox();
       this.dateTimePicker1 = new System.Windows.Forms.DateTimePicker();
       this.label2 = new System.Windows.Forms.Label();
       this.lblNowTime = new System.Windows.Forms.Label();
       this.label1 = new System.Windows.Forms.Label();
       this.groupBox1 = new System.Windows.Forms.GroupBox();
       this.timer1 = new System.Windows.Forms.Timer(this.components);
       this.tabControl1.SuspendLayout();
       this.tabPage1.SuspendLayout();
       this.groupBox2.SuspendLayout();
       this.groupBox1.SuspendLayout();
       this.SuspendLayout();
       //
       // monthCalendar1
       //
       this.monthCalendar1.Location = new System.Drawing.Point(4, 15);
       this.monthCalendar1.Name = "monthCalendar1";
       this.monthCalendar1.ShowToday = false;
       this.monthCalendar1.ShowTodayCircle = false;
       this.monthCalendar1.TabIndex = 0;
       this.monthCalendar1.TitleBackColor = System.Drawing.Color.LightSkyBlue;
       this.monthCalendar1.TitleForeColor = System.Drawing.Color.Black;
       this.monthCalendar1.TrailingForeColor = System.Drawing.Color.White;
       this.monthCalendar1.DateSelected += new System.Windows.Forms.DateRangeEventHandler(this.monthCalendar1_DateSelected);
       //
       // tabControl1
       //
       this.tabControl1.Controls.Add(this.tabPage1);
       this.tabControl1.Location = new System.Drawing.Point(4, 4);
       this.tabControl1.Name = "tabControl1";
       this.tabControl1.SelectedIndex = 0;
       this.tabControl1.Size = new System.Drawing.Size(300, 335);
       this.tabControl1.TabIndex = 1;
       //
       // tabPage1
       //
       this.tabPage1.Controls.Add(this.button2);
       this.tabPage1.Controls.Add(this.button1);
       this.tabPage1.Controls.Add(this.groupBox2);
       this.tabPage1.Controls.Add(this.groupBox1);
       this.tabPage1.Location = new System.Drawing.Point(4, 21);
       this.tabPage1.Name = "tabPage1";
       this.tabPage1.Padding = new System.Windows.Forms.Padding(3);
       this.tabPage1.Size = new System.Drawing.Size(292, 310);
       this.tabPage1.TabIndex = 0;
       this.tabPage1.Text = "时间和日期";
       this.tabPage1.UseVisualStyleBackColor = true;
       //
       // button2
       //
       this.button2.Location = new System.Drawing.Point(163, 279);
       this.button2.Name = "button2";
       this.button2.Size = new System.Drawing.Size(75, 23);
       this.button2.TabIndex = 4;
       this.button2.Text = "取消";
       this.button2.UseVisualStyleBackColor = true;
       this.button2.Click += new System.EventHandler(this.button2_Click);
       //
       // button1
       //
       this.button1.Location = new System.Drawing.Point(56, 279);
       this.button1.Name = "button1";
       this.button1.Size = new System.Drawing.Size(75, 23);
       this.button1.TabIndex = 3;
       this.button1.Text = "确定";
       this.button1.UseVisualStyleBackColor = true;
       this.button1.Click += new System.EventHandler(this.button1_Click);
       //
       // groupBox2
       //
       this.groupBox2.Controls.Add(this.dateTimePicker1);
       this.groupBox2.Controls.Add(this.label2);
       this.groupBox2.Controls.Add(this.lblNowTime);
       this.groupBox2.Controls.Add(this.label1);
       this.groupBox2.Location = new System.Drawing.Point(9, 182);
       this.groupBox2.Name = "groupBox2";
       this.groupBox2.Size = new System.Drawing.Size(277, 91);
       this.groupBox2.TabIndex = 2;
       this.groupBox2.TabStop = false;
       this.groupBox2.Text = "设置时间";
       //
       // dateTimePicker1
       //
       this.dateTimePicker1.Format = System.Windows.Forms.DateTimePickerFormat.Time;
       this.dateTimePicker1.Location = new System.Drawing.Point(80, 55);
       this.dateTimePicker1.Name = "dateTimePicker1";
       this.dateTimePicker1.ShowUpDown = true;
       this.dateTimePicker1.Size = new System.Drawing.Size(90, 21);
       this.dateTimePicker1.TabIndex = 3;
       //
       // label2
       //
       this.label2.AutoSize = true;
       this.label2.Location = new System.Drawing.Point(9, 59);
       this.label2.Name = "label2";
       this.label2.Size = new System.Drawing.Size(65, 12);
       this.label2.TabIndex = 2;
       this.label2.Text = "设置时间：";
       //
       // lblNowTime
       //
       this.lblNowTime.AutoSize = true;
       this.lblNowTime.Location = new System.Drawing.Point(81, 29);
       this.lblNowTime.Name = "lblNowTime";
       this.lblNowTime.Size = new System.Drawing.Size(0, 12);
       this.lblNowTime.TabIndex = 1;
       //
       // label1
       //
       this.label1.AutoSize = true;
       this.label1.Location = new System.Drawing.Point(9, 29);
       this.label1.Name = "label1";
       this.label1.Size = new System.Drawing.Size(65, 12);
       this.label1.TabIndex = 0;
       this.label1.Text = "当前时间：";
       //
       // groupBox1
       //
       this.groupBox1.Controls.Add(this.monthCalendar1);
       this.groupBox1.FlatStyle = System.Windows.Forms.FlatStyle.Flat;
       this.groupBox1.Location = new System.Drawing.Point(8, 5);
       this.groupBox1.Name = "groupBox1";
       this.groupBox1.Size = new System.Drawing.Size(278, 169);
       this.groupBox1.TabIndex = 1;
       this.groupBox1.TabStop = false;
       this.groupBox1.Text = "选择日期";
       //
       // timer1
       //
       this.timer1.Enabled = true;
       this.timer1.Interval = 1000;
       this.timer1.Tick += new System.EventHandler(this.timer1_Tick);
       //
       // Form1
       //
       this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
       this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
       this.ClientSize = new System.Drawing.Size(306, 341);
       this.Controls.Add(this.tabControl1);
       this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle;
       this.MaximizeBox = false;
       this.MinimizeBox = false;
       this.Name = "Form1";
       this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
       this.Text = "设置任务栏时间";
       this.Load += new System.EventHandler(this.Form1_Load);
       this.tabControl1.ResumeLayout(false);
       this.tabPage1.ResumeLayout(false);
       this.groupBox2.ResumeLayout(false);
       this.groupBox2.PerformLayout();
       this.groupBox1.ResumeLayout(false);
       this.ResumeLayout(false);

}

#endregion

private System.Windows.Forms.MonthCalendar monthCalendar1;
   private System.Windows.Forms.TabControl tabControl1;
   private System.Windows.Forms.TabPage tabPage1;
   private System.Windows.Forms.GroupBox groupBox1;
   private System.Windows.Forms.GroupBox groupBox2;
   private System.Windows.Forms.DateTimePicker dateTimePicker1;
   private System.Windows.Forms.Label label2;
   private System.Windows.Forms.Label lblNowTime;
   private System.Windows.Forms.Label label1;
   private System.Windows.Forms.Button button2;
   private System.Windows.Forms.Button button1;
   private System.Windows.Forms.Timer timer1;

}

来源：https://blog.csdn.net/qq_27489007/article/details/128306502