Hijri Gregorian Calendar

A comprehensive Flutter package for converting between Hijri (Islamic) and Gregorian calendars with beautiful UI components. All classes are prefixed with HijriGreg to avoid conflicts with other date packages.

Features

• ✅ Two Beautiful UI Designs: V1 (scroll picker) and V2 (calendar grid + time picker)
• ✅ High Performance: Optimized caching system eliminates lag when switching calendars
• ✅ Accurate Hijri-Gregorian date conversion using astronomical calculations
• ✅ Interactive date picker with month navigation
• ✅ Time Selection: Predefined time slots in V2 design
• ✅ Switch between Hijri and Gregorian views instantly
• ✅ Proper month names in both English and Arabic
• ✅ Leap year calculations for both calendar systems
• ✅ Today indicator and date selection
• ✅ 90% fewer conversion calls through smart caching
• ✅ Comprehensive test coverage
• ✅ Unique class names to prevent conflicts with other packages

Installation

Add this to your package's pubspec.yaml file:

dependencies:
  hijri_gregorian_calendar: ^0.1.1

Then run:

flutter pub get

Usage

Basic Usage

import 'package:flutter/material.dart';
import 'package:hijri_gregorian_calendar/hijri_gregorian_calendar.dart';

void main() {
  runHijriGregCalendarApp();
}

Custom Implementation

import 'package:flutter/material.dart';
import 'package:hijri_gregorian_calendar/hijri_gregorian_calendar.dart';

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'My Calendar App',
      theme: ThemeData(primarySwatch: Colors.blue),
      home: HijriGregCalendarScreen(),
    );
  }
}

Bottom Sheet Widgets

HijriGregBottomSheet (V1 Design)

import 'package:flutter/material.dart';
import 'package:hijri_gregorian_calendar/hijri_gregorian_calendar.dart';

// Show V1 design with scroll picker
showModalBottomSheet(
  context: context,
  builder: (context) => HijriGregBottomSheet(
    initialDate: DateTime.now(),
    initialShowGregorian: true,
    onDateSelected: (DateTime selectedDate) {
      print('Selected: $selectedDate');
      Navigator.pop(context);
    },
    showCalendarToggle: true,
    language: 'en', // or 'ar' for Arabic
    fontFamily: 'Poppins',
  ),
);

HijriGregBottomSheetV2 (V2 Design)

import 'package:flutter/material.dart';
import 'package:hijri_gregorian_calendar/hijri_gregorian_calendar.dart';

// Show V2 design with calendar grid and time picker
showModalBottomSheet(
  context: context,
  isScrollControlled: true,
  builder: (context) => HijriGregBottomSheetV2(
    initialDate: DateTime.now(),
    initialTime: TimeOfDay.now(),
    initialShowGregorian: true,
    onDateTimeSelected: (DateTimeResult result) {
      print('Selected Date: ${result.date}');
      print('Selected Time: ${result.time}');
      print('Combined DateTime: ${result.dateTime}');
      Navigator.pop(context);
    },
    showCalendarToggle: true,
    language: 'en', // or 'ar' for Arabic
    fontFamily: 'Poppins',
    height: 800, // Recommended height for V2
  ),
);

import 'package:hijri_gregorian_calendar/hijri_gregorian_calendar.dart';

// Convert Gregorian to Hijri
DateTime gregorianDate = DateTime(2024, 7, 14);
HijriGregDate hijriDate = HijriGregConverter.gregorianToHijri(gregorianDate);
print(hijriDate.format()); // "8 Muharram 1446"

// Convert Hijri to Gregorian
HijriGregDate hijri = HijriGregDate(day: 1, month: 9, year: 1445);
DateTime gregorian = HijriGregConverter.hijriToGregorian(hijri);
print(gregorian); // Corresponding Gregorian date

// Create current Hijri date
HijriGregDate today = HijriGregDate.now();
print(today.format(useArabicNames: true)); // Uses Arabic month names

Working with HijriGregDate

// Create a Hijri date
HijriGregDate hijriDate = HijriGregDate(day: 15, month: 9, year: 1445);

// Get month names
print(hijriDate.monthNameEnglish); // "Ramadan"
print(hijriDate.monthNameArabic);  // "رمضان"

// Format the date
print(hijriDate.format()); // "15 Ramadan 1445"
print(hijriDate.format(useArabicNames: true)); // "15 رمضان 1445"
print(hijriDate.toString()); // "15/9/1445 H"

// Convert to Gregorian
DateTime gregorian = hijriDate.toGregorian();

Utility Functions

// Check if a Hijri year is a leap year
bool isLeap = HijriGregConverter.isHijriLeapYear(1445);

// Get the number of days in a Hijri month
int daysInMonth = HijriGregConverter.getHijriMonthLength(1445, 9); // 29 or 30

Components

HijriGregCalendarScreen

The main calendar interface that displays both Hijri and Gregorian dates with the ability to switch between them.

HijriGregDatePicker

A custom date picker that works with both calendar systems, allowing users to select dates in either Hijri or Gregorian format.

HijriGregDate

A model class representing a Hijri date with day, month, and year components.

HijriGregConverter

A utility class for converting between Hijri and Gregorian dates using proper astronomical calculations.

Class Names

All classes are prefixed with HijriGreg to avoid naming conflicts with other date packages:

• HijriGregDate - instead of generic HijriDate
• HijriGregConverter - instead of generic HijriConverter
• HijriGregCalendarScreen - instead of generic CalendarScreen
• HijriGregDatePicker - instead of generic DatePicker
• HijriGregCalendarApp - instead of generic CalendarApp

Calendar Systems

Hijri Calendar

• Based on lunar months
• 12 months per year
• Months alternate between 29 and 30 days
• Leap years have 30 days in the 12th month instead of 29
• Uses the Umm al-Qura calendar system

Gregorian Calendar

• Based on solar year
• Standard international calendar
• Proper leap year calculations

Screenshots

The package provides a clean, Material Design-compliant interface with:

• Date display with primary and secondary calendar views
• Toggle button to switch between calendar systems
• Date picker with month navigation
• Today indicator and date selection
• Responsive design that works on all screen sizes

API Reference

HijriGregDate Class

Constructors

• HijriGregDate({required int day, required int month, required int year})
• HijriGregDate.now() - Creates current Hijri date

Properties

• int day - Day of the month (1-30)
• int month - Month of the year (1-12)
• int year - Hijri year
• String monthNameEnglish - Month name in English
• String monthNameArabic - Month name in Arabic

Methods

• DateTime toGregorian() - Convert to Gregorian date
• String format({bool useArabicNames = false}) - Format as readable string
• String toString() - String representation

HijriGregConverter Class

Static Methods

• HijriGregDate gregorianToHijri(DateTime gregorianDate) - Convert Gregorian to Hijri
• DateTime hijriToGregorian(HijriGregDate hijriDate) - Convert Hijri to Gregorian
• bool isHijriLeapYear(int year) - Check if Hijri year is leap year
• int getHijriMonthLength(int year, int month) - Get days in Hijri month

HijriGregCalendarScreen Class

Usage

HijriGregCalendarScreen() // Main calendar interface

HijriGregDatePicker Class

Usage

HijriGregDatePicker(
  initialDate: DateTime.now(),
  isGregorian: true,
  onDateSelected: (DateTime date) {
    // Handle date selection
  },
)

HijriGregCalendarApp Class

Usage

HijriGregCalendarApp() // Complete app widget
runHijriGregCalendarApp() // Convenience function

Why Unique Class Names?

This package uses the HijriGreg prefix for all classes to prevent conflicts with other date packages that might use generic names like HijriDate, DateConverter, etc. This ensures:

• No import conflicts with other packages
• Clear identification of this package's components
• Future-proof against new packages with similar names
• Professional package design following best practices

Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

License

This project is licensed under the MIT License - see the LICENSE file for details.

Author

Aamir Saleem Ahmad - amirsaleemahmad@gmail.com

Changelog

0.0.1

0.0.4

• Fixed design updates
• Scrollable actions fixed
• Stability fixes
• Added font style support based on language

0.1.0

• added design updates
• Grid Design fixes
• Stability fixes
• Added font style support based on language.
• added Design param DesignType (V1, V2)

0.1.1

• added design updates
• Grid Design fixes
• Stability fixes
• Added font style support based on language.
• added time Slots