Hellenic Holidays

A modern, comprehensive TypeScript/JavaScript package for handling Greek holidays, celebrations, and Orthodox calendar calculations.

Why Choose This Package?

• ✅ 100% Test Coverage with comprehensive test suite
• 🔍 Accurate Orthodox Easter calculations
• 📚 Extensive documentation and examples
• 💪 Modern TypeScript implementation with full type safety
• 🎯 Zero dependencies
• 🌍 Bilingual support (English/Greek)
• ⚡ Efficient date handling and calculations
• 🧪 Robust Jest testing suite

Features

• 🗓️ Complete list of Greek public holidays
• ⚡ Support for both fixed and movable holidays (like Orthodox Easter)
• 🔍 Easy date querying and validation
• 🌍 Bilingual support (Greek and English)
• 📅 Holiday type categorization (public, religious, customary)
• 💪 Written in TypeScript with full type support

Installation

npm install hellenic-holidays
# or
yarn add hellenic-holidays

Quick Start

import { HolidayService } from "hellenic-holidays";

const holidayService = new HolidayService();

// Check if a date is a holiday
const christmas = new Date(2024, 11, 25);
const result = holidayService.isHoliday(christmas);
console.log(result.isHoliday); // true
console.log(result.holiday?.nameEn); // "Christmas Day"
console.log(result.holiday?.nameEl); // "Χριστούγεννα"

// Get all holidays for a year
const holidays2024 = holidayService.getHolidays(2024);

// Get the next holiday from a specific date
const nextHoliday = holidayService.getNextHoliday(new Date());

API Reference

HolidayService

getHolidays(year: number): Holiday[]

Returns all holidays for the specified year.

isHoliday(date: Date): HolidayResponse

Checks if a given date is a holiday.

getHolidaysBetweenDates(startDate: Date, endDate: Date): Holiday[]

Returns all holidays between two dates.

getHolidaysByType(year: number, type: HolidayType): Holiday[]

Returns holidays of a specific type for the given year.

getNextHoliday(date: Date): Holiday | undefined

Returns the next upcoming holiday from the given date.

Types

enum HolidayType {
  PUBLIC = "public",
  CUSTOMARY = "customary",
  RELIGIOUS = "religious",
}

interface Holiday {
  date: Date;
  nameEn: string;
  nameEl: string;
  type: HolidayType;
  isMovable: boolean;
}

interface HolidayResponse {
  isHoliday: boolean;
  holiday?: Holiday;
}

Examples

Get All Holidays for a Year

import { HolidayService } from "hellenic-holidays";

const holidayService = new HolidayService();
const holidays = holidayService.getHolidays(2024);

holidays.forEach((holiday) => {
  console.log(
    `${holiday.date.toDateString()}: ${holiday.nameEn} (${holiday.nameEl})`
  );
});

Check for Holidays in a Date Range

import { HolidayService } from "hellenic-holidays";

const holidayService = new HolidayService();
const startDate = new Date(2024, 0, 1); // January 1, 2024
const endDate = new Date(2024, 1, 1); // February 1, 2024

const holidays = holidayService.getHolidaysBetweenDates(startDate, endDate);

Filter Holidays by Type

import { HolidayService, HolidayType } from "hellenic-holidays";

const holidayService = new HolidayService();

// Get only public holidays
const publicHolidays = holidayService.getHolidaysByType(
  2024,
  HolidayType.PUBLIC
);

// Get only religious holidays
const religiousHolidays = holidayService.getHolidaysByType(
  2024,
  HolidayType.RELIGIOUS
);

Comparison with Other Solutions

Feature	Hellenic Holidays	Others
TypeScript Support	✅ Full	Partial
Test Coverage	100%	Varies
Orthodox Easter Algorithm	✅ Accurate	Varies
Bilingual Support	✅ Complete	Limited
Modern Implementation	✅ ES2020+	Varies
Active Maintenance	✅ Regular	Varies
Documentation	✅ Comprehensive	Basic
Type Safety	✅ Full	Partial

Contributing

Contributions are welcome! Please feel free to submit a Pull Request. Check out our Contributing Guidelines for more information.

Support

⭐ If you find this package useful, please consider giving it a star on GitHub!

License

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