Secondary converter
Convert a Gregorian date into an Islamic civil Hijri date with repeatable arithmetic calendar results.
Enter a value and run the converter.
Guide
The Gregorian to Hijri Converter changes a standard Gregorian calendar date into an Islamic civil Hijri date. It is useful for date lookup, record comparison, and applications that need repeatable civil calendar results.
Because this page uses arithmetic civil Hijri rules, it avoids changing results based on local moon-sighting reports or official regional decisions.
What it handles
Use the date field to enter a Gregorian date in YYYY-MM-DD format.
This direction starts from the civil calendar date most records, websites, and appointment systems already use. The browser date field helps keep the input complete and avoids ambiguous month/day ordering.
The conversion treats the input as a whole Gregorian calendar day. It does not shift the result for time zone, time of day, or local sunset boundaries.
The result includes the numeric Hijri date, month name, and Julian Day Number reference.
The numeric Hijri date is useful for databases, spreadsheets, and forms, while the month name makes the result easier for people to read. Showing both reduces the chance of confusing a month number with another calendar system.
The Julian Day Number gives a neutral day-count reference for anyone comparing the output with another converter or application.
The same Gregorian input returns the same civil Hijri output each time.
Repeatability is valuable for published tables, test cases, import scripts, and records that may be reviewed months or years later. The result does not depend on live announcements or a changing regional calendar feed.
If you need an official observance date, use this as a civil reference first and then check the authority responsible for the place and community involved.
How to use
Enter the date you already know, such as 2026-07-01.
Start with the exact Gregorian date from your source record, calendar invite, document, or dataset. A complete date is required because each Gregorian day maps to one civil Hijri day in this model.
If the source includes a time, decide which local calendar date you want to convert before using the tool. The converter itself works only with the date portion.
Submit the form to get the civil Hijri date and month label.
After submission, the result panel shows the Islamic civil year, month, day, and readable month name. Keep the Gregorian source date nearby if you are creating a cross-calendar table or annotation.
The conversion is reversible with the Hijri to Gregorian page, which is useful when checking that copied values have not drifted during data entry.
For religious observance or official holidays, verify against the authority responsible for your location.
Civil arithmetic and local observance can differ, especially around Ramadan, Eid, and the first day of a lunar month. The page gives a stable lookup, not an announcement from a mosque, court, or government calendar.
When accuracy for a local event matters, record both the civil conversion and the official source you used for final confirmation.
Examples
The Gregorian date 2026-07-01 converts to Muharram 15, 1448 AH in this civil calculation.
This is a straightforward example of adding an Islamic civil date beside a Gregorian date. It can be used as a fixture when checking the homepage converter or building a small reference table.
If an official calendar gives a nearby Hijri date, the difference should be treated as a calendar-basis difference until the source methods are compared.
The same civil day converts back to the original Gregorian date with the reverse converter.
Round-trip examples are useful when you are verifying an import, spreadsheet formula, or calendar library. They show that both directions are using the same day-number bridge.
For production data, keep the original date and converted date together so future reviewers can tell which calendar direction was used.
FAQ
Use it as a civil estimate or lookup. Local Ramadan and Eid announcements may follow observation or official calendars.
The converter can help you understand the approximate civil Hijri date connected to a Gregorian day, but it does not know whether a local authority has announced the start or end of a month.
For public Ramadan or Eid communication, verify the date with the authority followed by the audience and avoid presenting the civil result as an official announcement.
The page uses the deterministic Islamic civil calendar, not a moon-visibility model.
The civil model uses fixed arithmetic rules to map dates through a shared day count. It is intentionally stable and does not calculate crescent visibility, testimony, or government calendar exceptions.
This makes the page well suited to repeatable lookup and less suited to deciding observance dates where local rules are decisive.
Reference
Gregorian input is first converted to a Julian Day Number, then that day number is converted into the arithmetic Hijri year, month, and day.
Using the Julian Day Number as an intermediate reference keeps the Gregorian-to-Hijri and Hijri-to-Gregorian tools aligned. It also gives technical users a simple way to compare results with other date libraries.
The output should be labeled as a civil Hijri result when it is copied into records or published material. That label keeps the conversion distinct from observation-based or official regional calendars.
Use cases
Add a civil Hijri equivalent beside Gregorian dates in notes, spreadsheets, and internal documentation.
This is helpful when the original record system stores Gregorian dates but the audience also expects an Islamic calendar reference. The civil result can sit beside the original date without replacing it.
For clarity, include the calendar basis in a column label or footnote when the annotated data will be shared beyond your own notes.
Create approximate civil Hijri references before checking final local calendars for religious or official use.
Early planning often happens before official announcements are available. A civil conversion gives a stable first reference for drafts, timelines, and internal discussion.
Before dates are published or used for attendance, travel, fasting, or holiday scheduling, replace estimates with the relevant official calendar where required.
Normalize Gregorian dates into a consistent civil Hijri representation for repeatable application behavior.
Applications that display multiple calendars need a documented rule so users see consistent values. Using a civil arithmetic basis avoids accidental differences between deployments, regions, or external services.
If an application also supports official regional calendars, store the basis separately so civil and official values are not mixed in the same field.
More questions
No. This page converts whole calendar dates and does not model sunset boundaries or time zones.
A Gregorian date entered on this page is treated as a full civil date, not as a timestamp. The result therefore stays the same regardless of the browser location or the time when the lookup is performed.
If your use case depends on whether an Islamic day has begun after local sunset, you need a location-aware calendar or authority in addition to this converter.
The Julian Day Number is the neutral day count used internally to bridge Gregorian and Hijri calendar calculations.
A shared day number makes it easier to keep both conversion directions consistent. It is also a useful debugging reference when another implementation returns a different calendar date.
Most visitors can ignore it, but developers and data maintainers may use it as a stable cross-calendar checkpoint.
Yes, compared with observation-based or official regional calendars. The civil arithmetic result is intentionally repeatable.
One-day differences are common when calendar systems decide month starts differently. This can happen without either source being careless, because they are answering different calendar questions.
Use the civil result for repeatable lookup, and use the official local calendar when the date controls observance, public holidays, or community scheduling.
