Trying to set PC clock programmatically just before Daylight Saving Time ends
- by Moe Sisko
To reproduce :
1) Add Microsoft.VisualBasic assembly to your project reference
2) Change PC timezone to : (GMT+10:00) Canberra, Melbourne, Sydney . Ensure PC is set to automatically adjust clock for daylight savings time. (For this timezone, daylight savings time ends at 3am on 4 Apr 2010.)
3) add following code :
public void SetNewDateTime(DateTime dt)
{
Microsoft.VisualBasic.DateAndTime.Today = dt; // ignores time component
Microsoft.VisualBasic.DateAndTime.TimeOfDay = dt; // ignores date component
}
private void button1_Click(object sender, EventArgs e)
{
DateTime dt = new DateTime(2010, 4, 5, 5, 0, 0); // XX
SetNewDateTime(dt); // XX
System.Threading.Thread.Sleep(500);
DateTime dt2 = new DateTime(2010, 4, 4, 1, 0, 0);
SetNewDateTime(dt2);
}
4) When button 1 is clicked, the PC clock eventually shows 2am, whereas 1 am was expected.
(If code marked at "XX" is removed, the clock sometimes shows the correct time of 1 am).
Any idea what is happening ?
(Or is there a more reliable way of setting the PC clock from C# code ?)
TIA.
