本文所述C#获取和修改系统时间的实现步骤为：系统的时间从 SystemTime 结构体中取出，并显示在textBox1上，从setDate,setTime控件中获取年，月，日，小时，分钟，秒信息，存入SystemTime结构体中，然后使用SetLocalTime(ref systemTime)设置为用户指定的时间。本代码编译后会有一个易于操作的窗体。

完整功能代码如下：

using System;using System.Drawing;using System.Collections;using System.ComponentModel;using System.Windows.Forms;using System.Data;using System.Runtime.InteropServices;namespace changesystime{ /// <summary> /// Form1 的摘要说明。 /// </summary> public class Form1 : System.Windows.Forms.Form { private System.Windows.Forms.GroupBox groupBox1; private System.Windows.Forms.TextBox textBox1; private System.Windows.Forms.GroupBox groupBox2; private System.Windows.Forms.Button button1; private System.Windows.Forms.Button button2; private System.Timers.Timer timer1; private System.Windows.Forms.DateTimePicker setDate; private System.Windows.Forms.DateTimePicker setTime; private System.ComponentModel.IContainer components; [StructLayout(LayoutKind.Sequential)] public struct SystemTime { public ushort wYear; public ushort wMonth; public ushort wDayOfWeek; public ushort wDay; public ushort wHour; public ushort wMinute; public ushort wSecond; public ushort wMiliseconds; } // 用于设置系统时间 [DllImport("Kernel32.dll")] public static extern bool SetLocalTime( ref SystemTime sysTime ); // 用于获得系统时间 [DllImport("Kernel32.dll")] public static extern void GetLocalTime(ref SystemTime sysTime); public Form1() { // // Windows 窗体设计器支持所必需的 // InitializeComponent(); // // TODO: 在 InitializeComponent 调用后添加任何构造函数代码 // } /// <summary> /// 清理所有正在使用的资源。 /// </summary> protected override void Dispose( bool disposing ) { if( disposing ) { if (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.groupBox1 = new System.Windows.Forms.GroupBox(); this.textBox1 = new System.Windows.Forms.TextBox(); this.groupBox2 = new System.Windows.Forms.GroupBox(); this.setTime = new System.Windows.Forms.DateTimePicker(); this.setDate = new System.Windows.Forms.DateTimePicker(); this.button1 = new System.Windows.Forms.Button(); this.button2 = new System.Windows.Forms.Button(); this.timer1 = new System.Timers.Timer(); this.groupBox1.SuspendLayout(); this.groupBox2.SuspendLayout(); ((System.ComponentModel.ISupportInitialize)(this.timer1)).BeginInit(); this.SuspendLayout(); // // groupBox1 // this.groupBox1.Controls.Add(this.textBox1); this.groupBox1.Location = new System.Drawing.Point(32, 24); this.groupBox1.Name = "groupBox1"; this.groupBox1.Size = new System.Drawing.Size(216, 64); this.groupBox1.TabIndex = 0; this.groupBox1.TabStop = false; this.groupBox1.Text = "系统当前时间"; // // textBox1 // this.textBox1.Location = new System.Drawing.Point(16, 24); this.textBox1.Name = "textBox1"; this.textBox1.ReadOnly = true; this.textBox1.Size = new System.Drawing.Size(184, 21); this.textBox1.TabIndex = 1; this.textBox1.Text = ""; // // groupBox2 // this.groupBox2.Controls.Add(this.setTime); this.groupBox2.Controls.Add(this.setDate); this.groupBox2.Location = new System.Drawing.Point(32, 112); this.groupBox2.Name = "groupBox2"; this.groupBox2.Size = new System.Drawing.Size(216, 64); this.groupBox2.TabIndex = 1; this.groupBox2.TabStop = false; this.groupBox2.Text = "时间设置为"; // // setTime // this.setTime.Format = System.Windows.Forms.DateTimePickerFormat.Time; this.setTime.Location = new System.Drawing.Point(128, 24); this.setTime.Name = "setTime"; this.setTime.ShowUpDown = true; this.setTime.Size = new System.Drawing.Size(72, 21); this.setTime.TabIndex = 1; this.setTime.TabStop = false; // // setDate // this.setDate.Format = System.Windows.Forms.DateTimePickerFormat.Short; this.setDate.Location = new System.Drawing.Point(8, 24); this.setDate.Name = "setDate"; this.setDate.Size = new System.Drawing.Size(104, 21); this.setDate.TabIndex = 0; // // button1 // this.button1.Location = new System.Drawing.Point(40, 200); this.button1.Name = "button1"; this.button1.Size = new System.Drawing.Size(64, 32); this.button1.TabIndex = 2; this.button1.Text = "设置"; this.button1.Click += new System.EventHandler(this.button1_Click); // // button2 // this.button2.Location = new System.Drawing.Point(168, 200); this.button2.Name = "button2"; this.button2.Size = new System.Drawing.Size(64, 32); this.button2.TabIndex = 3; this.button2.Text = "退出"; this.button2.Click += new System.EventHandler(this.button2_Click); // // timer1 // this.timer1.Enabled = true; this.timer1.SynchronizingObject = this; this.timer1.Elapsed += new System.Timers.ElapsedEventHandler(this.timer1_Elapsed); // // Form1 // this.AutoScaleBaseSize = new System.Drawing.Size(6, 14); this.ClientSize = new System.Drawing.Size(280, 261); this.Controls.Add(this.button2); this.Controls.Add(this.button1); this.Controls.Add(this.groupBox2); this.Controls.Add(this.groupBox1); this.Name = "Form1"; this.Text = "获取和设置系统时间"; this.groupBox1.ResumeLayout(false); this.groupBox2.ResumeLayout(false); ((System.ComponentModel.ISupportInitialize)(this.timer1)).EndInit(); this.ResumeLayout(false); } #endregion /// <summary> /// 应用程序的主入口点。 /// </summary> [STAThread] static void Main() { Application.Run(new Form1()); } private void button2_Click(object sender, System.EventArgs e) { this.Close(); // 关闭当前窗体 } private void timer1_Elapsed(object sender, System.Timers.ElapsedEventArgs e) { // 清除textBox1上的字符串 textBox1.Clear(); // 创建SystemTime结构体，用于接收系统当前时间 SystemTime systemTime = new SystemTime(); GetLocalTime(ref systemTime); // 获得系统的时间并存在SystemTime结构体中 // 将系统的时间从 SystemTime 结构体中中取出，并显示在textBox1上 textBox1.Text += systemTime.wYear.ToString() +"-"; textBox1.Text += systemTime.wMonth.ToString() + "-"; textBox1.Text += systemTime.wDay.ToString() + " "; textBox1.Text += systemTime.wHour.ToString() + ":"; textBox1.Text += systemTime.wMinute.ToString() + ":"; textBox1.Text += systemTime.wSecond.ToString(); // textBox1.Refresh(); } private void button1_Click(object sender, System.EventArgs e) { // 创建SystemTime结构体，用于接收用户设置的时间 SystemTime systemTime = new SystemTime(); // 从setDate,setTime控件中获取年，月，日，小时，分钟，秒信息，存入SystemTime结构体中 systemTime.wYear = (ushort)setDate.Value.Year; systemTime.wMonth = (ushort)setDate.Value.Month; systemTime.wDay = (ushort)setDate.Value.Day; systemTime.wHour = (ushort)setTime.Value.Hour; systemTime.wMinute = (ushort)setTime.Value.Minute; systemTime.wSecond = (ushort)setTime.Value.Second; // 将系统的时间设置为用户指定的时间 SetLocalTime(ref systemTime); } }}