C# 以编程方式更改系统日期

如何使用C#以编程方式更改本地系统的日期和时间

PInvoke调用Win32 API SetSystemTime（）

具有WMI类Win32_OperatingSystem的System.Management类，并在该类上调用SetDateTime 两者都要求调用方已被授予SeSystemTimePrivilege，并且此权限已启用

；我在这里转载了它，以提高清晰度

定义此结构：

[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;
}

将以下

extern

方法添加到类中：

[DllImport("kernel32.dll", SetLastError = true)]
public static extern bool SetSystemTime(ref SYSTEMTIME st);

然后使用结构的实例调用该方法，如下所示：

SYSTEMTIME st = new SYSTEMTIME();
st.wYear = 2009; // must be short
st.wMonth = 1;
st.wDay = 1;
st.wHour = 0;
st.wMinute = 0;
st.wSecond = 0;

SetSystemTime(ref st); // invoke this method.

---

您可以使用对DOS命令的调用，但在windows dll中调用该函数是一种更好的方法

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)2009;
    updatedTime.Month = (ushort)3;
    updatedTime.Day = (ushort)16;
    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);
}  

---

因为我在评论中提到了它，这里有一个C++/CLI包装器：

#include <windows.h>
namespace JDanielSmith
{
    public ref class Utilities abstract sealed /* abstract sealed = static */
    {
    public:
        CA_SUPPRESS_MESSAGE("Microsoft.Security", "CA2122:DoNotIndirectlyExposeMethodsWithLinkDemands")
        static void SetSystemTime(System::DateTime dateTime) {
            LARGE_INTEGER largeInteger;
            largeInteger.QuadPart = dateTime.ToFileTimeUtc(); // "If your compiler has built-in support for 64-bit integers, use the QuadPart member to store the 64-bit integer."


            FILETIME fileTime; // "...copy the LowPart and HighPart members [of LARGE_INTEGER] into the FILETIME structure."
            fileTime.dwHighDateTime = largeInteger.HighPart;
            fileTime.dwLowDateTime = largeInteger.LowPart;


            SYSTEMTIME systemTime;
            if (FileTimeToSystemTime(&fileTime, &systemTime))
            {
                if (::SetSystemTime(&systemTime))
                    return;
            }


            HRESULT hr = HRESULT_FROM_WIN32(GetLastError());
            throw System::Runtime::InteropServices::Marshal::GetExceptionForHR(hr);
        }
    };
}

---

这里已经有很多很好的观点和方法，但是这里有一些目前被忽略的规范，我觉得这些规范可能会让一些人困惑

在Windows Vista 7、8操作系统上，这需要UAC提示才能获得必要的管理权限，以成功执行

SetSystemTime

功能。原因是调用过程需要SE\u SYSTEMTIME\u NAME特权

SetSystemTime

函数需要协调世界时（UTC）中的

SYSTEMTIME

结构。否则它将无法按预期工作 根据您获取

DateTime

值的位置/方式，在

SYSTEMTIME

结构中设置相应值之前，最好安全使用

代码示例：

DateTime tempDateTime = GetDateTimeFromSomeService();
DateTime dateTime = tempDateTime.ToUniversalTime();

SYSTEMTIME st = new SYSTEMTIME();
// All of these must be short
st.wYear = (short)dateTime.Year;
st.wMonth = (short)dateTime.Month;
st.wDay = (short)dateTime.Day;
st.wHour = (short)dateTime.Hour;
st.wMinute = (short)dateTime.Minute;
st.wSecond = (short)dateTime.Second;

// invoke the SetSystemTime method now
SetSystemTime(ref st); 

---

使用此功能更改系统时间（在窗口8中测试）

示例： 调用表单的加载方法 设定日期（“5-6-92”）； 设定时间（“凌晨2:4:5”）

proc.Arguments=“/C Date:”+dateInYourSystemFormat

这是工作功能：

void setDate(string dateInYourSystemFormat)
{
    var proc = new System.Diagnostics.ProcessStartInfo();
    proc.UseShellExecute = true;
    proc.WorkingDirectory = @"C:\Windows\System32";
    proc.CreateNoWindow = true;
    proc.FileName = @"C:\Windows\System32\cmd.exe";
    proc.Verb = "runas";
    proc.Arguments = "/C Date:" + dateInYourSystemFormat;
    try
    {
        System.Diagnostics.Process.Start(proc);
    }
    catch
    {
        MessageBox.Show("Error to change time of your system");
        Application.ExitThread();
    }
}

小心！。 如果从结构中删除未使用的属性，则会设置错误的时间。因为这个，我损失了一天。我认为结构的顺序很重要

这是正确的结构：

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;

        };

如果运行SetSystemTime（），它将按预期工作。 对于测试，我将时间设置如下

SystemTime st = new SystemTime();
st.Year = 2019;
st.Month = 10;
st.Day = 15;
st.Hour = 10;
st.Minute = 20;
st.Second = 30;

SetSystemTime(ref st);

时间设置：2019年10月15日10:20，没问题。

但我删除了未使用的DayOfWeek属性

public struct SystemTime
            {
                public ushort Year;
                public ushort Month;
                public ushort Day;
                public ushort Hour;
                public ushort Minute;
                public ushort Second;
                public ushort Millisecond;

            };

SystemTime st = new SystemTime();
    st.Year = 2019;
    st.Month = 10;
    st.Day = 15;
    st.Hour = 10;
    st.Minute = 20;
    st.Second = 30;

    SetSystemTime(ref st);

运行相同的代码，但时间设置为：10.10.2019 20:30

请注意顺序和SystemTime结构的所有字段。

---

Yusuf

为任何正在寻找的人提供复制/粘贴课程

using System;
using System.ComponentModel;
using System.Runtime.InteropServices;

public static class SystemDateTime
{
    [DllImport("kernel32.dll", EntryPoint = "SetSystemTime", SetLastError = true)]
    private static extern bool Win32SetSystemTime(ref SystemTime sysTime);

    [StructLayout(LayoutKind.Sequential)]
    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;
    };

    public static void SetSystemDateTime(int year, int month, int day, int hour,
        int minute, int second, int millisecond)
    {
        SystemTime updatedTime = new SystemTime
        {
            Year = (ushort) year,
            Month = (ushort) month,
            Day = (ushort) day,
            Hour = (ushort) hour,
            Minute = (ushort) minute,
            Second = (ushort) second,
            Millisecond = (ushort) millisecond
        };

        // If this returns false, then the problem is most likely that you don't have the 
        // admin privileges required to set the system clock
        if (!Win32SetSystemTime(ref updatedTime))
        {
            throw new Win32Exception(Marshal.GetLastWin32Error());
        }
    }

    public static void SetSystemDateTime(DateTime dateTime)
    {
        SetSystemDateTime(dateTime.Year, dateTime.Month, dateTime.Day, dateTime.Hour, dateTime.Minute,
            dateTime.Second, dateTime.Millisecond);
    }
}

---

编写自定义C++/CLI包装并引入另一个程序集比编写9行结构更容易？？只是不要让Marc Gravell看到您的结构！；-）由于某些原因，我对答案的编辑被拒绝，但至少对于Win7，我发现我需要以管理员身份运行该程序才能正常工作。请参阅：最好说此方法设置UTC时间。所以，如果你按日期时间计算当地时间，那么现在它会设置错误的时间。我遇到了这个问题，很长一段时间都不明白是什么错了……值得一提的是，这个程序需要管理员的许可才能正常工作……有趣的是，像这样的一些问题刚刚得到了回答，而其他问题却被垃圾报上了“你尝试了什么？”。。。奇怪…我不能直接用它来改变系统时间。我已经在多个项目中成功地使用了这段代码。您是否以管理员身份运行可执行文件？否则这个代码肯定不行。哇，这个解决了我的问题。问题是您的本地时间的时区妨碍了获取正确的时间，所以“DateTime DateTime=tempDateTime.ToUniversalTime（）；”行解决了所有问题。我试用了您的代码，但似乎不起作用。无论如何，我找到了我想要的解决方案，并进行了测试。这是一个经过测试的、准备编译并运行的代码版本，我为此至少经历了4次堆栈溢出，因为我不熟悉c#或这些库。

public struct SystemTime
            {
                public ushort Year;
                public ushort Month;
                public ushort Day;
                public ushort Hour;
                public ushort Minute;
                public ushort Second;
                public ushort Millisecond;

            };

SystemTime st = new SystemTime();
    st.Year = 2019;
    st.Month = 10;
    st.Day = 15;
    st.Hour = 10;
    st.Minute = 20;
    st.Second = 30;

    SetSystemTime(ref st);

using System;
using System.ComponentModel;
using System.Runtime.InteropServices;

public static class SystemDateTime
{
    [DllImport("kernel32.dll", EntryPoint = "SetSystemTime", SetLastError = true)]
    private static extern bool Win32SetSystemTime(ref SystemTime sysTime);

    [StructLayout(LayoutKind.Sequential)]
    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;
    };

    public static void SetSystemDateTime(int year, int month, int day, int hour,
        int minute, int second, int millisecond)
    {
        SystemTime updatedTime = new SystemTime
        {
            Year = (ushort) year,
            Month = (ushort) month,
            Day = (ushort) day,
            Hour = (ushort) hour,
            Minute = (ushort) minute,
            Second = (ushort) second,
            Millisecond = (ushort) millisecond
        };

        // If this returns false, then the problem is most likely that you don't have the 
        // admin privileges required to set the system clock
        if (!Win32SetSystemTime(ref updatedTime))
        {
            throw new Win32Exception(Marshal.GetLastWin32Error());
        }
    }

    public static void SetSystemDateTime(DateTime dateTime)
    {
        SetSystemDateTime(dateTime.Year, dateTime.Month, dateTime.Day, dateTime.Hour, dateTime.Minute,
            dateTime.Second, dateTime.Millisecond);
    }
}