OneCalendar: 55+ Calendars

About OneCalendar: 55+ Calendars

OneCalendar - 2026 is a smart all-in-one calendar app that helps you view, compare, and convert dates across 56+ calendar systems from around the world.

Whether you need the Gregorian Calendar, Islamic Hijri Calendar, Persian Calendar, Hebrew Calendar, Chinese Calendar, Julian Calendar, Nanakshahi Calendar, Nepali Calendar, or other global and regional calendars, OneCalendar gives you a clean and easy way to explore dates in one place.

🌍 56+ Calendar Systems in One App

OneCalendar supports a wide range of international, religious, cultural, historical, and regional calendar systems, including:

📅 Gregorian Calendar
🌙 Islamic Hijri Calendar variants
🕋 Umm al-Qura, Civil, Saudi Sighting & Observational Hijri
☀️ Persian / Jalali Calendar
✡️ Hebrew & Samaritan Calendars
☬ Nanakshahi Calendar
🏛️ Julian & Revised Julian Calendars
🐉 Chinese, Dangi & Vietnamese Calendars
🕉️ Hindu Calendar Systems and Panchang
📆 Indian Saka Calendar
🗻 Nepali Bikram Sambat & Nepal Sambat
🌏 Buddhist, Japanese, Minguo & Thai Solar Calendars
⛪ Coptic, Ethiopic & Ethiopic Amete Alem Calendars
⭐ Baháʼí Calendar
🗿 Mayan Long Count, Tzolkʼin & Haabʼ Calendars
🌞 Aztec Tonalpohualli & Xiuhpohualli Calendars
🏔️ Tibetan, Javanese & Balinese Pawukon Calendars
🔥 Zoroastrian, Assyrian, Armenian & Egyptian Calendars
🏺 Roman Pre-Julian, Babylonian, Berber/Amazigh & Icelandic Calendars
🗓️ ISO Week Date, Academic, Fiscal & Liturgical Calendars
🌐 Juche and French Republican Calendars
And many more calendar systems.

✨ Key Features

📅 Multi-Calendar View
View your selected main calendar and compare it with other calendars in a clean month layout.

🔄 Date Converter
Convert dates between selected calendar systems easily, including Gregorian, Hijri, Persian, Hebrew, Chinese, Julian, and more.

🌙 Hijri & Islamic Date Support
Check Islamic dates with multiple Hijri variants such as Umm al-Qura, Civil, Observational, and Tabular models.

🗓️ Events
View local seeded calendar events and important reminder-style entries for supported calendar systems.

⚙️ Calendar Settings
Choose your main calendar, select comparison calendars, reorder them, and personalize how dates are displayed.

➕➖ Date Offset Support
Adjust supported calendars by up to -3 to +3 days, useful for variant-based or observational date differences.

🔍 Easy Calendar Selection
Search and select calendars during onboarding or from settings.

🎨 Clean & Simple Design
A modern, lightweight, and user-friendly interface built for daily use.

🔒 Privacy-Friendly Experience
No account or login required. App settings are saved locally on your device.

🎯 Why Use OneCalendar?

Most calendar apps focus on only one or two calendars. OneCalendar is designed for users who need a broader calendar experience in one place.

It is useful for:

Students
Professionals
Travelers
Researchers
Religious date tracking
Cultural event planning
Islamic date checking
International date conversion
Comparing global calendar systems
Learning historical and regional calendars
📌 Important Note

Some observational and historical calendar systems may use deterministic models, approximations, or variant-based calculations. Where applicable, the app is designed to support calendar notes, certainty, and variant awareness.

📥 Download OneCalendar - 2026

Install OneCalendar - 2026 and manage global calendars, date conversion, events, and calendar comparisons in one simple app.

Keywords

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