Hijri Date Converter

How Hijri Date Converter works

Convert any Gregorian date to the Hijri calendar and back. Uses the Umm al-Qura calendar built into your browser — no API, no upload. Everything happens inside this page: the tool reads your input, runs the calculation or conversion locally, and hands the result back to you. Nothing is transmitted, because there is no backend to transmit it to.

That design choice is deliberate. Most free tool sites upload your files to a server, process them there, and quietly keep a copy. Toolcin cannot do that — the site is a set of static files. If your connection dropped the moment the page finished loading, every tool would still work.

Two calendars, one day

The Gregorian date is converted to the Hijri (Islamic) calendar using a standard arithmetic algorithm. The result is a day, month and year in the Hijri system, alongside the Gregorian date you entered.

The conversion is deterministic — the same input always gives the same output — which is what you want for a converter, though not necessarily what a local moon-sighting authority will announce.

Why the dates can differ by a day

The Hijri calendar is observational in practice: months begin with the sighting of the new moon, which varies by location and by year. A calculated calendar approximates that with fixed rules, so official dates in Pakistan, Saudi Arabia and elsewhere can differ by a day.

For Ramadan, Eid and contractual deadlines, use the date your local authority publishes rather than a calculated one.

The year offset

A Hijri year is about 354 days, so it drifts roughly 11 days earlier each Gregorian year. That is why Ramadan moves through the seasons on a 33-year cycle.

Good to know

• Works offline once loaded, including on flights and in locked-down networks.
• No file size limit beyond your device's own memory.
• Free to use, with no account and no usage counter.
• Results are produced locally, so they are not logged or shared with anyone.

Questions