CHANGELOG.md

@@ -5,16 +5,6 @@ All notable changes to this project will be documented in this file.
 The format follows [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 This project adheres to [Semantic Versioning](https://semver.org/).
 
-## 1.0.1
-
-### Fixed
-
-- `toHijri` now normalizes the input `DateTime` to its UTC calendar day before
-  lookup (via `date.toUtc()`), matching the UTC-midnight contract of `toGregorian`.
-  Previously, passing a local `DateTime` on a host west of UTC could return the
-  previous Hijri day, breaking `toHijri(toGregorian(y, m, d))` round-trips.
-  Applies to both the UAQ and FCNA engines.
-
 ## [1.0.0] - 2026-05-25
 
 ### Added

lib/src/engines/fcna.dart

@@ -234,12 +234,13 @@ int _fcnaDaysInMonth(int hy, int hm) {
 // ---- FCNA Gregorian -> Hijri ----
 
 HijriDate? _fcnaToHijri(DateTime date) {
-  // Normalize to UTC calendar day so the result is deterministic regardless of
+  // FCNA criterion is UTC-based, so UTC date components ensure correct round-trips.
-  // the host timezone and whether the caller passes a UTC or local DateTime.
-  // This is symmetric with toGregorian, which always returns DateTime.utc().
-  final d = date.toUtc();
   final inputMs =
-      DateTime.utc(d.year, d.month, d.day).millisecondsSinceEpoch.toDouble();
+      DateTime.utc(
+        date.year,
+        date.month,
+        date.day,
+      ).millisecondsSinceEpoch.toDouble();
 
   final kApprox = _utcMsToKApprox(inputMs - 15 * msPerDay);
   final k0 = kApprox.floor();

lib/src/engines/uaq.dart

@@ -36,11 +36,7 @@ int _dateUtcMs(int year, int month, int day) {
 }
 
 HijriDate? _uaqToHijri(DateTime date) {
-  // Normalize to UTC calendar day so the result is deterministic regardless of
+  final inputUtc = _dateUtcMs(date.year, date.month, date.day);
-  // the host timezone and whether the caller passes a UTC or local DateTime.
-  // This is symmetric with toGregorian, which always returns DateTime.utc().
-  final d = date.toUtc();
-  final inputUtc = _dateUtcMs(d.year, d.month, d.day);
 
   // Binary search: find the last table entry whose Gregorian start date <= input.
   int lo = 0;

pubspec.yaml

@@ -2,10 +2,11 @@ name: hijri_core
 description: >
   Hijri/Gregorian calendar conversion for Dart and Flutter. Pluggable engine
   system with built-in Umm al-Qura and FCNA calendars. Zero dependencies.
-version: 1.0.1
+version: 1.0.0
 homepage: https://github.com/acamarata/hijri-core-dart
 repository: https://github.com/acamarata/hijri-core-dart
 issue_tracker: https://github.com/acamarata/hijri-core-dart/issues
+publisher: ariccamarata.com
 topics:
   - hijri
   - islamic

test/hijri_core_test.dart

@@ -93,41 +93,6 @@ void main() {
     });
   });
 
-  // ---- UAQ round-trips (UTC day boundary) ----
-
-  group('UAQ round-trips', () {
-    test('toHijri(toGregorian(1446,9,1)) == 1446/9/1', () {
-      final greg = toGregorian(1446, 9, 1);
-      expect(greg, isNotNull);
-      final h = toHijri(greg!);
-      expect(h, isNotNull);
-      expect(h!.hy, equals(1446));
-      expect(h.hm, equals(9));
-      expect(h.hd, equals(1));
-    });
-    test('local DateTime with same UTC day round-trips correctly', () {
-      // toGregorian returns DateTime.utc(); converting it to local must still
-      // produce the correct Hijri day (regression for UTC-west hosts).
-      final greg = toGregorian(1446, 9, 1);
-      expect(greg, isNotNull);
-      final localGreg = greg!.toLocal();
-      final h = toHijri(localGreg);
-      expect(h, isNotNull);
-      expect(h!.hy, equals(1446));
-      expect(h.hm, equals(9));
-      expect(h.hd, equals(1));
-    });
-    test('toHijri(toGregorian(1318,1,1)) == 1318/1/1 (table lower bound)', () {
-      final greg = toGregorian(1318, 1, 1);
-      expect(greg, isNotNull);
-      final h = toHijri(greg!);
-      expect(h, isNotNull);
-      expect(h!.hy, equals(1318));
-      expect(h.hm, equals(1));
-      expect(h.hd, equals(1));
-    });
-  });
-
   // ---- UAQ isValid ----
 
   group('UAQ isValid', () {