public static void Main(string[] args)
{
DateTimeWeekNumber dtwn = new DateTimeWeekNumber(DateTime.Parse("2006-12-31"));
Console.WriteLine("ISO standards sample (2006-12-31):");
Console.WriteLine($"ISOWeekNoExtended: {dtwn.ISOWeekNoExtended}");
Console.WriteLine($"ISOWeekNoCompact : {dtwn.ISOWeekNoCompact}");
Console.WriteLine($"WeekNoExtended : {dtwn.WeekNoExtended}");
Console.WriteLine($"WeekNoCompact : {dtwn.WeekNoCompact}");
Console.WriteLine();
dtwn = new DateTimeWeekNumber(DateTime.Now);
Console.WriteLine($"Today ({DateTime.Now.ToString("yyyy-MM-dd")}):");
Console.WriteLine($"DayNo : {dtwn.DayNo} ({DateTime.Now.DayOfWeek})");
Console.WriteLine($"WeekNo : {dtwn.WeekNo}");
Console.WriteLine($"WeekNoString2 : {dtwn.WeekNoString2}");
Console.WriteLine($"YearNo : {dtwn.YearNo}");
Console.WriteLine($"Today (ToString) : {dtwn.ToString()}");
Console.WriteLine();
Console.WriteLine($"WeekNoCompact : {dtwn.WeekNoCompact}");
Console.Write("\nPress any key...");
Console.ReadKey();
}
public static DateTime?WeekNoCompactToDate(string reference)
{
int Year = -1;
int.TryParse(reference.Substring(0, 2), out Year);
if (Year == -1)
{
return(null);
}
Year = Year + 2000;
int Week = -1;
int.TryParse(reference.Substring(2, 2), out Week);
if (Week == -1)
{
return(null);
}
int Day = -1;
int.TryParse(reference.Substring(4, 1), out Day);
if (Day == -1)
{
return(null);
}
DateTime ThisYear = new DateTime(Year, 1, 1);
DateTimeWeekNumber dwn = new DateTimeWeekNumber(ThisYear);
//Begin of the week
ThisYear = ThisYear.AddDays(1 - dwn.DayNo);
int Days = (Week - 1) * 7 + (Day - 1);
return(ThisYear.AddDays(Days));
}
