Date and Time

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hai.......

I want to change system date using c#.I got code from web,but its not working properly.Its changing system time but thats not correct. is there any other chance to change system time.

My code is

C#

[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;
}

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

SYSTEMTIME st    = new SYSTEMTIME();
st.wDay          = (short)DateTime.Now.Day;
st.wDayOfWeek    = (short)DateTime.Now.DayOfWeek;
st.wHour         = (short)(DateTime.Now.Hour+6);
st.wMilliseconds = (short)DateTime.Now.Millisecond;
st.wMinute       = (short)(DateTime.Now.Minute);
st.wMonth        = (short)DateTime.Now.Month;
st.wSecond       = (short)DateTime.Now.Second;
st.wYear         = (short)(DateTime.Now.Year);
bool result      = SetSystemTime(ref st); //returns true for me

Posted 20-Jan-11 23:29pm

sujithmtla

Updated 20-Jan-11 23:33pm

#realJSOP

v2

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Hemraj Gujar 21-Jan-11 5:37am

Hi,

I found one article, hope it will be of help

http://www.longhorncorner.com/Forums/ShowMessages.aspx?ThreadID=73042

2 solutions

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**JF2015** · Answer 1 · 2011-01-20T23:33:00

Hi,

this code is working for me:

C#

[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)2008;
  updatedTime.Month = (ushort)4;
  updatedTime.Day = (ushort)23;
 // UTC time; it will be modified according to the regional settings of the target computer so the actual hour might differ
  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);
}

#realJSOP · Answer 2 · 2011-01-20T23:37:00

Solution 2

One other comment - instead of calling DateTime.Now for every property, call it once and then use that value:

C#

DateTime now           = DateTime.Now;
SystemTime updatedTime = new SystemTime();
updateTime.Year        = (ushort)(now.Year);
updateTime.Month       = (ushort)(now.Month);
...etc

Posted 20-Jan-11 23:37pm

#realJSOP

Comments

Sergey Alexandrovich Kryukov 21-Jan-11 13:56pm

Important fix - my 5.
You should have said re-calling Now is a bug, not just a sloppiness; would mess up results.