void Main()
{
var haftalar = GetWeeks(new DateTime(2015, 1, 1), 60);
}
private List<Week> GetWeeks(DateTime start, int weeks)
{
var firstMonday = GetMonday(start);
return (from w in Enumerable.Range( 0, weeks )
let monday = firstMonday.AddDays( w * 7 )
select new Week {
Year = monday.Year,
WeekNo = GetIso8601WeekOfYear(monday),
Start = monday,
End = monday.AddDays(6)
} )
.ToList();
}
private DateTime GetMonday(DateTime day)
{
return day.AddDays( day.DayOfWeek == DayOfWeek.Sunday ? -6 : 1-(int)day.DayOfWeek );
}
private List<Week> GetWeekDaysForYear(int year)
{
var fdoy = new DateTime(year, 1, 1);
var ldoy = new DateTime(year, 12, 31);
var weeks = Enumerable.Range(0,366).Select (e => fdoy.AddDays(e)).Where (e => e.Year == year)
.GroupBy (d => GetIso8601WeekOfYear(d))
.OrderBy (d => d.Key);
var days = from w in weeks
let firstDay = w.Min ()
let lastDay = w.Max()
let fdow = firstDay != fdoy ? firstDay : lastDay.AddDays(-6)
let ldow = lastDay != ldoy ? lastDay : firstDay.AddDays(6)
select new Week { Year=year, WeekNo= w.Key, Start= fdow, End = ldow };
return days.ToList();
}
// Based on Shawn Steel's code on MSDN blog
// http://blogs.msdn.com/b/shawnste/archive/2006/01/24/iso-8601-week-of-year-format-in-microsoft-net.aspx
// This presumes that weeks start with Monday.
// Week 1 is the 1st week of the year with a Thursday in it.
public static int GetIso8601WeekOfYear(DateTime time)
{
// Seriously cheat. If its Monday, Tuesday or Wednesday, then it'll
// be the same week# as whatever Thursday, Friday or Saturday are,
// and we always get those right
DayOfWeek day = CultureInfo.InvariantCulture.Calendar.GetDayOfWeek(time);
if (day >= DayOfWeek.Monday && day <= DayOfWeek.Wednesday)
{
time = time.AddDays(3);
}
// Return the week of our adjusted day
return CultureInfo.InvariantCulture.Calendar.GetWeekOfYear(time, CalendarWeekRule.FirstFourDayWeek, DayOfWeek.Monday);
}
public class Week
{
public int Year { get; set; }
public int WeekNo { get; set; }
public DateTime Start { get; set; }
public DateTime End { get; set; }
}
