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■No57547 (shu さん) に返信
> ■No57546 (ちか さん) に返信
>
> DateTime dtToday = DateTime.Today;
> DateTime dtWeekFirst = dtToday.AddDays(-(int)dtToday.DayOfWeek);
> DateTime dtMonday = dtWeekFirst.AddDays((int)DayOfWeek.Monday);
>
> こんなんでどうでしょう？
Shuさんありがとうございます。
int iWeek = 1; //月の週番号指定
Calendar cal = CultureInfo.CurrentCulture.Calendar;
CalendarWeekRule cwr = CultureInfo.CurrentCulture.DateTimeFormat.CalendarWeekRule;
DayOfWeek firstDay = DayOfWeek.Sunday;
DateTime DateMonthS = new DateTime();
DateMonthS = DateTime.Parse(”対象年月の1日”); // ”2011/03/01”
int weekNumberS = cal.GetWeekOfYear(DateMonthS, cwr, firstDay);
if (weekNumberS == 0)
{
DateMonthS = System.DateTime.Now;
}
DateTime DateMonthE = new DateTime();
DateMonthE = new DateTime(DateMonthS.Year, DateMonthS.Month, DateTime.DaysInMonth(DateMonthS.Year, DateMonthS.Month));
int weekNumberE = cal.GetWeekOfYear(DateMonthE, cwr, firstDay);
int MonthWeek = weekNumberE - weekNumberS + 1;
if (iWeek < 1 && MonthWeek < iWeek)
{
//週番号が範囲外の場合エラーメッセージ
break;
}
int weekNumber = (iWeek - 1); // 年からの週番号
週番号から対象の週の最初の日付を取るには、、、、
どうしたらよいでしょうか？
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