A free, accurate Islamic calendar toolkit built to serve Muslims and researchers around the world with precision and ease.
GPTStand was created with one purpose: to make HijriβGregorian date conversion effortlessly accurate and universally accessible. Whether you're verifying a birth date for official documents, planning an Islamic event, or conducting historical research, GPTStand gives you reliable results instantly β with no sign-up, no fees, and no clutter.
Our flagship tool is the Hijri β Gregorian Date Converter, which supports conversion in both directions using established astronomical Hijri calculations. The tool is aligned with the Umm Al-Qura calendar standard used officially in Saudi Arabia, and it's available in both English and full right-to-left Arabic.
We use astronomical Hijri calculation methods to produce conversion results. While the Umm Al-Qura calendar β the official Islamic calendar of Saudi Arabia β may occasionally differ by Β±1 day due to actual lunar crescent sighting practices, our tool provides the most mathematically precise estimate possible and clearly communicates this distinction to users.
Our users include Muslims tracking prayer dates, Ramadan, Hajj, and Islamic holidays; government and legal professionals converting official document dates; genealogists and historians working with historical Islamic records; and students and educators researching the Islamic calendar system.
All calculations happen entirely in your browser. We do not collect, store, or transmit the dates you enter. Your data stays with you. For more details, see our Privacy Policy.
Have a question, a correction, or a suggestion? We'd love to hear from you. Visit our Contact page to reach out.