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int year = 2012, day = 205;
DateTime dt = new DateTime(year, 1, 1);
dt = dt.AddDays(day - 1);
Console.WriteLine("{0}年第{1}天是{2}月{3}日", year, day, dt.Month, dt.Day);
DateTime dt = new DateTime(2012, 1, 1);
dt = dt.AddDays(204);//2012-7-23
int dats = new DateTime(2012, 7, 23).DayOfYear;//205
static string GetDate(int year,int days)
{
return Convert.ToDateTime(year + ".01.01").AddDays(days).ToString("yyyy.MM.dd");
}
// Console.WriteLine(GetDate(2011,341)); //2011.12.08