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week of year berechnen #2

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week of year berechnen #2

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f0ab879
week of year berechnen
dasKamael Mar 13, 2024
1c45560
split weekOfYear extension in two
dasKamael Mar 13, 2024
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32 changes: 32 additions & 0 deletions lib/extensions/date_time.extension.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -12,4 +12,36 @@ extension DateTimeExtension on DateTime {
bool get isSameYear {
return DateTime.now().year == year;
}

int get weekOfYear {
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Brauchen denke ich einen anderen Namen dafür. Wusste nicht direkt was damit gemeint ist

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weekOfTheYear oder andere vorschläge?

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@JPM84 JPM84 Mar 13, 2024 •
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.weekOfYear passt eigentlich, ist typisch z.B. in C#.

.week oder .day wäre noch schöner.

// Datum auf Mitternacht setzen
DateTime date = DateTime(year, month, day);

// Berechne die differenz zum Beginn des Jahres
int dayOfYear = date.dayOfYear;

// Wochendtag des 1. Januar (1 = Montag, 7 = Sonntag).
int weekdayOfFirstDay = DateTime(year, 1, 1).weekday;

// Korrigiere zum ISO 8601-Format (Montag = 0, Sonntag = 6).
weekdayOfFirstDay--;

// Berechne die ISO-Woche.
int weekNumber = ((dayOfYear - weekdayOfFirstDay + 10) / 7).floor();

if (weekNumber < 1) {
// Die Woche gehört zum letzten Jahr.
return DateTime(year - 1, 12, 31).weekOfYear;
} else if (weekNumber > 52) {
// Prüfe, ob die Woche zum nächsten Jahr gehört.
int daysInYear = DateTime(year, 12, 31).difference(DateTime(year, 1, 1)).inDays + 1;
int threshold = (daysInYear - 31 + weekdayOfFirstDay - 10) ~/ 7;
if (weekNumber > threshold) return 1;
}
return weekNumber;
}

int get dayOfYear {
return DateTime(year, month, day).difference(DateTime(year, 1, 1)).inDays + 1;
}
}