C# 計算周数

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C#周数

1.

private int GetWeekOfCurrDate(DateTime p_Time)

{

DateTime _Year = new DateTime(p_Time.Year, 1, 1);

int _StarWeek = (int)_Year.DayOfWeek;

int _Days = p_Time.DayOfYear + _StarWeek;

if (_Days < 7) return 1;

int _Value = (_Days / 7);

if (_Days % 7 != 0) _Value++;

return _Value;

}

//DateCode
                        System.Globalization.GregorianCalendar gc = new System.Globalization.GregorianCalendar();
                        int weekOfYear = gc.GetWeekOfYear(DateTime.Now, System.Globalization.CalendarWeekRule.FirstDay, DayOfWeek.Monday);//0:sunday,1:monday
                        string week = Convert.ToString(weekOfYear);
                        if (week.Length == 1)
                        {
                            week = '0' + week;
                        }
                        DateCode = DateTime.Now.Year.ToString().Substring(2, 2) + week;