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43 lines
1.4 KiB
Dart
43 lines
1.4 KiB
Dart
import '../utils/helpers.dart';
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Map<String, String> buildHolidayMapAT(int year) {
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final Map<String, String> m = {};
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void add(DateTime d, String name) => m[ymd(d)] = name;
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add(DateTime(year, 1, 1), 'Neujahr');
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add(DateTime(year, 1, 6), 'Heilige Drei Könige');
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add(DateTime(year, 5, 1), 'Staatsfeiertag');
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add(DateTime(year, 8, 15), 'Mariä Himmelfahrt');
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add(DateTime(year, 10, 26), 'Nationalfeiertag');
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add(DateTime(year, 11, 1), 'Allerheiligen');
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add(DateTime(year, 12, 8), 'Mariä Empfängnis');
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add(DateTime(year, 12, 25), 'Christtag');
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add(DateTime(year, 12, 26), 'Stefanitag');
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final easter = _easterSunday(year);
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add(easter.add(const Duration(days: 1)), 'Ostermontag');
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add(easter.add(const Duration(days: 39)), 'Christi Himmelfahrt');
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add(easter.add(const Duration(days: 50)), 'Pfingstmontag');
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add(easter.add(const Duration(days: 60)), 'Fronleichnam');
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return m;
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}
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DateTime _easterSunday(int year) {
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final a = year % 19;
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final b = year ~/ 100;
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final c = year % 100;
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final d = b ~/ 4;
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final e = b % 4;
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final f = (b + 8) ~/ 25;
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final g = (b - f + 1) ~/ 3;
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final h = (19 * a + b - d - g + 15) % 30;
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final i = c ~/ 4;
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final k = c % 4;
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final l = (32 + 2 * e + 2 * i - h - k) % 7;
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final m = (a + 11 * h + 22 * l) ~/ 451;
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final month = (h + l - 7 * m + 114) ~/ 31; // 3=March, 4=April
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final day = ((h + l - 7 * m + 114) % 31) + 1;
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return DateTime(year, month, day);
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}
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