public static DateTime WeekFirstDay(int wn, int year)
{
int adjust = 0;
GregorianCalendar cal = new GregorianCalendar();
DateTime jan1st = new DateTime(year, 1, 1);
if (jan1st.DayOfWeek == DayOfWeek.Monday ||
jan1st.DayOfWeek == DayOfWeek.Tuesday ||
jan1st.DayOfWeek == DayOfWeek.Wednesday ||
jan1st.DayOfWeek == DayOfWeek.Thursday)
{
adjust = 1;
}
else
{
adjust = 0;
}
DateTime date = cal.AddWeeks(jan1st, wn - adjust);
while (date.DayOfWeek != DayOfWeek.Monday)
{
date = date.AddDays(-1);
}
return(date);
}
public static DateTime GetLastDayInWeek(int Year, int Week)
{
GregorianCalendar Calendar = new GregorianCalendar(GregorianCalendarTypes.USEnglish);
DateTime FirstDay = new DateTime(Year, 1, 1);
DateTime CurrentDay = Calendar.AddWeeks(FirstDay, Week);
return(Calendar.AddDays(CurrentDay, 7 - (int)Calendar.GetDayOfWeek(CurrentDay) + 1));
}
static void Main(string[] args)
{
Calendar my = new GregorianCalendar();
DateTime myTime = new DateTime(2003, 11, 3, 8, 42, 40, 100, my);
Console.WriteLine("Current Time: {0}", myTime.ToUniversalTime());
myTime = my.AddWeeks(myTime, 12);
Console.WriteLine("After add 12 weeks, the timer is:{0}", myTime.ToLocalTime());
Console.WriteLine("This yeaar is Leap Year?" + my.IsLeapYear(2003, 0));
}
private long GetNextPoint(ref DateTime t, int unit, int unitSteps)
{
switch (unit)
{
case 0:
t = gc.AddSeconds(t, unitSteps);
break;
case 1:
t = gc.AddMinutes(t, unitSteps);
break;
case 2:
t = gc.AddHours(t, unitSteps);
break;
case 3:
t = gc.AddDays(t, unitSteps);
break;
case 4:
t = gc.AddWeeks(t, unitSteps);
break;
case 5:
t = gc.AddMonths(t, unitSteps);
break;
case 6:
t = gc.AddYears(t, unitSteps);
break;
default:
break;
}
return(Util.TicksToMillis(t.Ticks));
}