Dedicated to Accurate Islamic Lunar Timekeeping
Hijri Dates was established with a singular mission: to provide the global Muslim community, researchers, and everyday users with accurate, accessible, and mathematically validated Islamic calendar calculations, astronomical insights, and date conversion tools.
Our Mission & Core Values
In an increasingly interconnected world, observing religious duties requires precision. Whether timing the arrival of Ramadan, planning the annual Hajj pilgrimage, scheduling financial Zakat distribution, or simply knowing today’s Islamic date, millions of believers depend on reliable timekeeping. Hijri Dates bridges ancient observational traditions with modern astronomical algorithms to ensure every date, month, and conversion is transparent and scientifically sound.
Astronomical Calculation Methodology
Our calculation engines implement established celestial mechanics and official national standards:
1. Umm al-Qura Calendar Standard (Kingdom of Saudi Arabia): Our primary algorithmic base aligns with the official Umm al-Qura calendar of Makkah al-Mukarramah. Under this standard, a new month begins if astronomical conjunction (the birth of the new moon) occurs before sunset and the moon sets after sunset at the coordinates of the Holy Kaaba (Latitude 21.4225° N, Longitude 39.8262° E).
2. Observational Adjustment & Regional Moonsighting: We recognize that local Islamic authorities in countries like Morocco, Pakistan, Oman, the United Kingdom, and North America may rely on physical naked-eye crescent observation (Ru’yat al-Hilal). As a result, dates for sensitive religious months—such as Ramadan, Shawwal, and Dhu al-Hijjah—are continuously reviewed and cross-referenced with official supreme court and national moon-sighting committee announcements.
3. Bi-Directional Conversion Mathematics: Our date converter employs rigorous Julian Day Number (JDN) algorithms, ensuring that conversions between the Hijri lunar year and the Gregorian solar calendar remain precise across past, present, and future timelines.
Our Editorial & Astronomical Review Team
Accuracy and transparency guide every piece of content published on Hijri Dates. Our educational guides, historical analyses, and calendar data are prepared and verified by a dedicated team with backgrounds in astronomical computing, Islamic history, and digital software development.
Astronomical Computing Desk
Data Verification & Algorithms
Responsible for auditing our calculation formulas against official observatory publications, Julian day indices, and global moon-sighting registries.
Islamic History & Research Desk
Cultural & Historical Research
Authors our in-depth guides covering the origin of the Hijri calendar, the historical context of the twelve lunar months, and prophetic traditions.
Technical & Product Integrity
Web & Accessibility Standards
Ensures that our conversion engines, calculators, and daily updates remain lightning-fast, ad-unobtrusive, and accessible across mobile and desktop devices.
Transparency & Religious Observance Disclaimer
While our digital calculations reflect the highest degree of mathematical precision according to official lunar tables, Hijri Dates recognizes that the formal commencement of major Islamic holidays (specifically Eid al-Fitr, Eid al-Adha, and the 1st of Ramadan) is ultimately determined by the recognized religious and judicial authorities in each respective country. We encourage our readers to confirm significant community observances with their local mosques and regional crescent-sighting councils.
Explore Our Core Tools & Research
We invite you to make full use of our free suite of Islamic timekeeping resources:
Check the live daily Islamic date on our Today’s Date tool, convert any past or future date with our Hijri to Gregorian Converter, calculate your exact lunar age with the Islamic Age Calculator, or explore our definitive guides on the History of the Hijri Calendar and 12 Islamic Months in Order with Meanings.
For questions, data corrections, or technical feedback, please reach out through our Contact Page.