Symbian(Set System Time)如何设置修改系统时间

void C******::SetTime()
{
TDateTime iDataTime;
iDataTime.SetHour(9);
iDataTime.SetMinute(20);
iDataTime.SetSecond(10);

iDataTime.SetDay(1);
iDataTime.SetMonth(TMonth(9));
iDataTime.SetYear(2008);
TTime iTime(iDataTime);
User::SetHomeTime(iDataTime);
}