using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace ConsoleApplication6
{
class Program
{
static void Main(string[] args)
{
GregorianCalendar gc = new GregorianCalendar();
int weekOfYear = gc.GetWeekOfYear(DateTime.Now, CalendarWeekRule.FirstDay, DayOfWeek.Monday);
Console.WriteLine("当前第{0}周", weekOfYear);
DateTime startDate, lastDate;
for (int i = 1; i <= 53; i++)
{
GetDaysOfWeeks(DateTime.Now.Year, i, out startDate, out lastDate);
Console.WriteLine("第{0}周", i);
Console.WriteLine(startDate);
Console.WriteLine(lastDate);
}
Console.ReadLine();
}
public static bool GetDaysOfWeeks(int year, int index, out DateTime first, out DateTime last)
{
first = DateTime.MinValue;
last = DateTime.MinValue;
if (year < 1700 || year > 9999)
{
return false;
}
if (index < 1 || index > 53)
{
return false;
}
DateTime startDay = new DateTime(year, 1, 1);
DateTime endDay = new DateTime(year + 1, 1, 1).AddMilliseconds(-1);
int dayOfWeek = 0;
if (Convert.ToInt32(startDay.DayOfWeek.ToString("d")) > 0)
dayOfWeek = Convert.ToInt32(startDay.DayOfWeek.ToString("d"));
if (dayOfWeek == 0) { dayOfWeek = 7; }
if (index == 1)
{
first = startDay.AddDays(7 - dayOfWeek - 6);
if (dayOfWeek == 6)
{
last = first;
}
else
{
last = startDay.AddDays((7 - dayOfWeek));
}
}
else
{
first = startDay.AddDays((8 - dayOfWeek) + (index - 2) * 7);
last = first.AddDays(6);
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