C# 以编程方式更改系统日期

Change system date programmatically

提问by Yoann. B

How can I change the local system's date & time programmatically with C#?

如何使用 C# 以编程方式更改本地系统的日期和时间？

采纳答案by Andrew Hare

Here is where I found the answer.; I have reposted it here to improve clarity.

这是我找到答案的地方。; 我在这里重新发布它以提高清晰度。

Define this structure:

定义这个结构：

[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;
}

Add the following externmethod to your class:

将以下extern方法添加到您的类中：

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

Then call the method with an instance of your struct like this:

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.

回答by Avram

1. PInvoke to call Win32 API SetSystemTime,(example)
2. System.Management classes with WMI class Win32_OperatingSystem and call SetDateTime on that class.

1. PInvoke 调用 Win32 API SetSystemTime，（示例）
2. System.Management 类与 WMI 类 Win32_OperatingSystem 并在该类上调用 SetDateTime。

Both require that the caller has been granted SeSystemTimePrivilege and that this privilege is enabled.

两者都要求调用者已被授予 SeSystemTimePrivilege 并启用此权限。

回答by MarmouCorp

You can use a call to a DOS command but the invoke of the function in the windows dll is a better way to do it.

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);
}  

回答by Dаn

Since I mentioned it in a comment, here's a C++/CLI wrapper:

由于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);
        }
    };
}

The C# client code is now very simple:

C# 客户端代码现在非常简单：

JDanielSmith.Utilities.SetSystemTime(DateTime.Now);

回答by Derek W

A lot of great viewpoints and approaches are already here, but here are some specifications that are currently left out and that I feel might trip up and confuse some people.

这里已经有很多很棒的观点和方法，但这里有一些规范目前被遗漏了，我觉得可能会绊倒并混淆一些人。

1. On Windows Vista, 7, 8 OSthis will requirea UAC Prompt in order to obtain the necessary administrative rights to successfully execute the SetSystemTimefunction. The reason is that calling process needs the SE_SYSTEMTIME_NAMEprivilege.
2. The SetSystemTimefunction is expecting a SYSTEMTIMEstruct in coordinated universal time (UTC). It will not work as desired otherwise.

1. 在Windows Vista、7、8 操作系统上，这将需要UAC 提示以获得成功执行该SetSystemTime功能所需的管理权限。原因是调用进程需要SE_SYSTEMTIME_NAME权限。
2. 该SetSystemTime函数需要一个SYSTEMTIME协调世界时(UTC)的结构体。否则它将无法正常工作。

Depending on where/ how you are getting your DateTimevalues, it might be best to play it safe and use ToUniversalTime()before setting the corresponding values in the SYSTEMTIMEstruct.

根据获取DateTime值的位置/方式，最好ToUniversalTime()在设置SYSTEMTIME结构中的相应值之前安全使用并使用它。

Code example:

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); 

回答by Hiren Raiyani

Use this function to change the time of system (tested in window 8)

使用此功能更改系统时间（在窗口 8 中测试）

 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();
        }
    }
void setTime(string timeInYourSystemFormat)
    {
        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 time " + timeInYourSystemFormat;
        try
        {
            System.Diagnostics.Process.Start(proc);
        }
        catch
        {
            MessageBox.Show("Error to change time of your system");
            Application.ExitThread();
        }
    }

Example:Call in load method of formsetDate("5-6-92"); setTime("2:4:5 AM");

示例：调用表单setDate("5-6-92"); 的load 方法；setTime("2:4:5 AM");

回答by Javad_Raouf

proc.Arguments = "/C Date:" + dateInYourSystemFormat;

proc.Arguments = "/C 日期：" + dateInYourSystemFormat;

This Is Work Function:

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();
    }
}

回答by Yusuf GURDAG

Be Careful!. If you delete unused property from the structure, it sets the time wrong. I ve lost 1 day because of this. I think order of the structure is important.

当心！。如果您从结构中删除未使用的属性，则会将时间设置错误。因为这个，我失去了 1 天。我认为结构的顺序很重要。

This is correct structure:

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;

        };

If you run the SetSystemTime(), it works as expected. For test I set the time as below;

如果您运行 SetSystemTime()，它会按预期工作。为了测试，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);

The time set: 15.10.2019 10:20, its ok.

时间设定：15.10.2019 10:20，没关系。

But I delete DayOfWeek property which not used ;

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);

Run same code but the time set to: 10.10.2019 20:30

运行相同的代码，但时间设置为：10.10.2019 20:30

Please be careful order and all fields of SystemTime structure. Yusuf

请小心顺序和 SystemTime 结构的所有字段。优素福