islamic_utility 1.4.1

Prayer times, sunnah times, and qibla direction utilities with a Meeus-based astronomical engine.

islamic_utility

islamic_utility is a Dart package for prayer time calculation, sunnah times, and qibla direction.

ID: islamic_utility adalah package Dart untuk kalkulasi waktu sholat, sunnah times, dan arah kiblat.

Features

• Prayer schedule: imsak, fajr, dhuha, sunrise, dhuhr, asr, maghrib, isha
• Cross-day boundaries: ishaBefore, fajrAfter
• Utilities: currentPrayer, nextPrayer, timeForPrayer
• SunnahTimes: middleOfTheNight, lastThirdOfTheNight
• Qibla: direction in degrees 0..360
• JavaneseCalendar: pasaran Jawa (Legi, Pahing, Pon, Wage, Kliwon)

ID: Semua output PrayerTimes disimpan dalam UTC DateTime.

Installation

dependencies:
  islamic_utility: ^1.4.0

dart pub get

ID: Jika dipakai lokal dulu, Anda bisa gunakan path: dependency.

Quick Start

import 'package:islamic_utility/islamic_utility.dart';

final params = CalculationMethod.indonesian.parameters;
final prayerTimes = PrayerTimes(
  date: DateTime.utc(2026, 5, 1),
  coordinates: const Coordinates(-6.2, 106.8),
  calculationParameters: params,
  precision: true,
);

final now = DateTime.now().toUtc();
final current = prayerTimes.currentPrayer(date: now);
final next = prayerTimes.nextPrayer(date: now);

print('Current: $current');
print('Next: $next at ${prayerTimes.timeForPrayer(next)}');
print('Qibla: ${Qibla.qibla(const Coordinates(-6.2, 106.8))}');

Main API

• Coordinates(latitude, longitude)
• CalculationMethod + CalculationMethod.xxx.parameters
• CalculationParameters.copyWith(...)
• PrayerTimes(...)
• SunnahTimes(prayerTimes)
• Qibla.qibla(coordinates)
• HijriCalendar()
• HijriCalendar.withOfficial(...)
• fromGregorianOfficial(...)
• fromGregorianOfficialRange(from: ..., to: ...)
• JavaneseCalendar.fromGregorian(...)
• JavaneseCalendar.fromGregorianRange(...)
• UnifiedCalendar.resolve(...)
• UnifiedCalendar.resolveRange(...)

ID: Referensi API lengkap ada di doc/11-api-reference.md.

Advanced Configuration

final params = CalculationMethod.indonesian.parameters.copyWith(
  madhab: Madhab.hanafi,
  highLatitudeRule: HighLatitudeRule.seventhOfTheNight,
  dhuhaOffsetMinutes: 30,
);

params.adjustments[Prayer.fajr] = 2;
params.adjustments[Prayer.isha] = 2;

Timezone Contract

• Use UTC consistently in domain logic.
• Always pass explicit date for currentPrayer and nextPrayer.
• Convert UTC output to local timezone in presentation/UI layer.

final nowUtc = DateTime.now().toUtc();
final next = prayerTimes.nextPrayer(date: nowUtc);

Precision

• precision: true -> keeps second-level precision
• precision: false -> rounds to nearest minute

Hijri Quick Start

Offline (Local / Umm al-Qura)

final calendar = HijriCalendar();

final local = calendar.fromGregorian(
  DateTime.utc(2026, 3, 21),
  method: HijriMethod.calculatedLocal,
);

final umm = calendar.fromGregorian(
  DateTime.utc(2026, 3, 21),
  method: HijriMethod.ummAlQura,
);

Official (Single Date)

final client = HttpHijriAdjustmentClient(
  baseUrl: 'https://your-backend.example.com/api',
  apiKey: 'your-api-key',
);

final calendar = HijriCalendar.withOfficial(
  adjustmentClient: client,
);

final hijri = await calendar.fromGregorianOfficial(DateTime.utc(2026, 3, 21));
print('${hijri.year}-${hijri.month}-${hijri.day} (${hijri.meta.source})');

Official (Range, Optimized Fetch)

final results = await calendar.fromGregorianOfficialRange(
  from: DateTime.utc(2026, 3, 15),
  to: DateTime.utc(2026, 3, 30),
);

Range behavior:

• Prefetch anchors and adjustments by range.
• Resolve per-day values from cache/local flow.
• Avoid per-day remote loop in range mode.

Javanese Pasaran Quick Start

final java = const JavaneseCalendar();
final item = java.fromGregorian(DateTime.utc(2026, 3, 21));
print(item.pasaran.label); // Legi/Pahing/Pon/Wage/Kliwon
print(item.weton); // e.g. "Sabtu Kliwon"

Unified Calendar Quick Start (Transition-Friendly)

final unified = UnifiedCalendar();
final result = await unified.resolve(
  DateTime.utc(2026, 3, 21),
  options: const CalendarResolveOptions(
    includeHijri: true,
    includeJavanese: true,
    hijriMethod: HijriMethod.calculatedLocal,
  ),
);

print(result.gregorian); // always available
print(result.hijri); // optional, based on options
print(result.javanese); // optional, based on options

Runnable Examples

• dart run example/islamic_utility_example.dart
• dart run example/method_comparison_example.dart
• dart run example/custom_adjustment_example.dart
• dart run example/hijri_methods_example.dart
• dart run example/hijri_official_mock_example.dart
• dart run example/hijri_official_http_example.dart
• dart run example/hijri_official_range_hive_example.dart
• dart run example/javanese_pasaran_example.dart
• dart run example/unified_calendar_example.dart
• dart run example/hijri_syawal_boundary_anchor_example.dart

Flutter + Hive (Persistent Range Cache)

islamic_utility tetap package Dart murni. Untuk Flutter, lakukan inisialisasi Hive.initFlutter() di layer aplikasi, lalu berikan Box ke helper example: example/hijri_official_range_hive_flutter_example.dart.

import 'package:hive_flutter/hive_flutter.dart';
import 'package:islamic_utility/islamic_utility.dart';
import 'package:your_app/hijri_official_range_hive_flutter_example.dart';

Future<void> bootstrapHijri() async {
  await Hive.initFlutter();
  final adjustmentBox = await Hive.openBox<dynamic>(
    'islamic_utility_adjustment_cache',
  );
  final anchorBox = await Hive.openBox<dynamic>(
    'islamic_utility_anchor_cache',
  );

  final results = await convertRangeWithFlutterHive(
    adjustmentBox: adjustmentBox,
    anchorBox: anchorBox,
    baseUrl: 'https://your-backend.example.com/api',
    apiKey: 'your-api-key',
    from: DateTime.utc(2026, 3, 15),
    to: DateTime.utc(2026, 3, 30),
  );

  for (final item in results) {
    print('${item.year}-${item.month}-${item.day} (${item.meta.source})');
  }
}

Testing

dart test

Documentation

• Index: doc/README.md
• API Reference (Bilingual): doc/11-api-reference.md
• FAQ & Troubleshooting (Bilingual): doc/12-faq-troubleshooting.md
• Hijri Integration Guide (Bilingual): doc/13-hijri-integration-guide.md
• Backend API Spec (Hijri Adjustment): doc/backend/README.md
• Public API Spec: doc/01-public-api-spec.md
• Core Calculation: doc/02-calculation-core-spec.md
• Astronomical Engine: doc/03-astronomical-formulas.md