Set System Time In C#

In this blog, you will learn how to change System Time using kernel32.dll.

If you want to change your system time through code then you can achieve it through kernel32.dll.

Kernel32.dll is a Windows kernel module. It is a 32-bit dynamic link library that is used in Windows operating systems. 

using System.Runtime.InteropServices;

A pointer to a SYSTEMTIME structure that contains the new system date and time.

[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;
}
class Program {
    static void Main(string[] args) {
            SYSTEMTIME st = new SYSTEMTIME();
            st.wYear = 2022; // must be short
            st.wMonth = 03;
            st.wDay = 01;
            st.wHour = 19;
            st.wMinute = 04;
            st.wSecond = 00;
            SetSystemTime(ref st);
        }
        [DllImport("kernel32.dll", SetLastError = true)]
    public static extern bool SetSystemTime(ref SYSTEMTIME st);
}

SetSystemTime function Sets the current system time and date. The system time is expressed in Coordinated Universal Time (UTC).