Calcul du numéro de la semaine

Bonjour,

est ce que quelqu'un connaitrait un script pour calculer le numéro d'une semaine donnée en parametre (sans les bugs!) ??

Tu peux trouver ça avec la méthode GetWeekOfYear() de l'objet Calendar :

Code:

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1 2 3

System.Globalization.GregorianCalendar cal = new System.Globalization.GregorianCalendar(System.Globalization.GregorianCalendarTypes.Localized); int week = cal.GetWeekOfYear(DateTime.Now, System.Globalization.CalendarWeekRule.FirstDay, DayOfWeek.Monday);

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A utiliser avec le calendrier qui va bien (ici grégorien) et selon la culture. Par contre je suis pas certian du second paramètre (CalendarWeekRule.FirstDay)

Selon Wikipédia (http://fr.wikipedia.org/wiki/ISO_860...9ro_de_semaine), la semaine 1 est celle qui contient le premier jeudi de l'année. Autrement dit, la semaine qui possède au moins 4 jours dans la nouvelle année. Du coup, le bon code est :

Code:

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1 2	System.Globalization.GregorianCalendar cal = new System.Globalization.GregorianCalendar(System.Globalization.GregorianCalendarTypes.Localized); int week = cal.GetWeekOfYear(DateTime.Now, System.Globalization.CalendarWeekRule.FirstFourDayWeek, DayOfWeek.Monday);

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J'ai trouvé ca qui marche bien et sans bug du 1er janvier et du 31 decembre

Citation:

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private static int WeekNumber_Entire4DayWeekRule(DateTime date)
{
// Updated 2004.09.27. Cleaned the code and fixed a bug.
// Compared the algorithm with code published here .
// Tested code successfully against the other algorithm
// for all dates in all years between 1900 and 2100.
// Thanks to Marcus Dahlberg for pointing out the deficient logic.

// Calculates the ISO 8601 Week Number
// In this scenario the first day of the week is monday,
// and the week rule states that:
// [...] the first calendar week of a year is the one
// that includes the first Thursday of that year and
// [...] the last calendar week of a calendar year is
// the week immediately preceding the first
// calendar week of the next year.
// The first week of the year may thus start in the
// preceding year

const int JAN = 1;
const int DEC = 12;
const int LASTDAYOFDEC = 31;
const int FIRSTDAYOFJAN = 1;
const int THURSDAY = 4;
bool ThursdayFlag = false;

// Get the day number since the beginning of the year
int DayOfYear = date.DayOfYear;

// Get the numeric weekday of the first day of the
// year (using sunday as FirstDay)
int StartWeekDayOfYear =
(int)(new DateTime(date.Year, JAN, FIRSTDAYOFJAN)).DayOfWeek;
int EndWeekDayOfYear =
(int)(new DateTime(date.Year, DEC, LASTDAYOFDEC)).DayOfWeek;

// Compensate for the fact that we are using monday
// as the first day of the week
if (StartWeekDayOfYear == 0)
StartWeekDayOfYear = 7;
if (EndWeekDayOfYear == 0)
EndWeekDayOfYear = 7;

// Calculate the number of days in the first and last week
int DaysInFirstWeek = 8 - (StartWeekDayOfYear);
int DaysInLastWeek = 8 - (EndWeekDayOfYear);

// If the year either starts or ends on a thursday
// it will have a 53rd week
if (StartWeekDayOfYear == THURSDAY || EndWeekDayOfYear ==
THURSDAY)
ThursdayFlag = true;

// We begin by calculating the number of FULL weeks
// between the start of the year and our date.
// The number is rounded up, so the smallest possible value is 0.
int FullWeeks = (int)Math.Ceiling((DayOfYear - (DaysInFirstWeek)) /
7.0);

int WeekNumber = FullWeeks;

// If the first week of the year has at least four days, then
// the actual week number for our date can be incremented by one.
if (DaysInFirstWeek >= THURSDAY)
WeekNumber = WeekNumber + 1;

// If week number is larger than week 52
// (and the year doesn't either start or end on a thursday)
// then the correct week number is 1.
if (WeekNumber > 52 && !ThursdayFlag)
WeekNumber = 1;

// If week number is still 0, it means that we are trying
// to evaluate the week number for a week that belongs
// in the previous year(since that week has 3 days or
// less in our date's year).
// We therefore make a recursive call using
// the last day of the previous year.
if (WeekNumber == 0)
WeekNumber = WeekNumber_Entire4DayWeekRule(
new DateTime(date.Year - 1, DEC, LASTDAYOFDEC));
return WeekNumber;
}

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Merci en tout cas pour ton aide

OK. Juste que c'est la même chose, mais en 83 lignes de code au lieu de 2. :aie:
Bonne chance