How the Hijri Calendar Works in the UAE
The Hijri calendar is a lunar calendar of twelve months, with each year lasting 354 or 355 days. That makes it about eleven days shorter than a Gregorian year, so its dates move gradually through the seasons. In the UAE, you may see a Hijri date beside a Gregorian date on a document, an official notice or a calendar entry. The two dates describe the same day through different systems rather than marking separate events.
A year measured by the Moon
A Gregorian year follows the solar cycle and normally contains 365 days, or 366 in a leap year. A Hijri year consists of twelve lunar months containing either 29 or 30 days. Its total is therefore 354 or 355 days. There is no extra month added to keep Ramadan, Eid or another observance in one season. Across successive Gregorian years, a Hijri date usually appears around ten to twelve days earlier.
This movement explains why Ramadan can fall during the cooler part of the UAE year for a period and then progress towards warmer months over a longer span. The shift also means that a Gregorian date cannot permanently correspond to one Hijri date. A conversion shown for a particular year may not apply to another year, even when the month and day look similar.
The twelve Hijri months
The months are Muharram, Safar, Rabi Al Awwal, Rabi Al Thani, Jumada Al Awwal, Jumada Al Thani, Rajab, Shaaban, Ramadan, Shawwal, Dhu Al Qidah and Dhu Al Hijjah. English spellings vary because the names are transliterated from Arabic. A form may therefore use a slightly different spelling without referring to a different month.
A Hijri month traditionally begins when the new crescent is established after sunset. Actual crescent observation matters for religious dates, while calculated calendars help people plan and display estimated dates in advance. Visibility can depend on the Moon’s position and local observation, so advance calendar entries for lunar holidays remain provisional. In the UAE, the final timing of occasions such as Eid Al Fitr and Eid Al Adha follows the government announcement based on moon sighting.
This is why two calendar tools can occasionally differ by a day near the start of a month. One may use an arithmetic method, while another may reflect an announced observation. For travel arrangements, leave planning or an appointment written only in Hijri notation, check which convention the organisation uses. An official announcement takes precedence when the date concerns a UAE public holiday.
What Hijra and AH mean
Hijri year numbering begins from 622 CE, the year associated with the Hijra: the migration of the Prophet Mohammed and the early Muslim community from Makkah to Madinah. The word Hijra means migration. It marks the starting point of the Islamic era, although the calendar system was organised after the migration itself. Hijri years may carry the abbreviation AH, from the Latin expression Anno Hegirae, meaning “in the year of the Hijra”.
The year number alone cannot be converted by simply adding 622. Hijri years are shorter, and many of them fit into the same span as fewer Gregorian years. A proper conversion must account for completed lunar months, the length assigned to each month and, where relevant, the observed beginning of the month. Near sunset, context can matter as well because Islamic calendar dates run from sunset to sunset, rather than changing at midnight in the Gregorian manner.
Where you encounter Hijri dates in the UAE
Daily work schedules, school messages and ordinary appointments in the UAE often use Gregorian dates, but the Hijri calendar remains visible in public life. You may encounter it on government correspondence, certificates, application records, tenancy-related paperwork and notices that show both systems. A date such as 15 Shaaban 1448 AH identifies the day through the Islamic era; the adjacent Gregorian date helps readers place it in the civil calendar used for routine planning.
Hijri dates are especially prominent around Ramadan, the two Eid periods, Arafah Day, Hijri New Year and the Prophet Mohammed’s Birthday. These occasions affect office hours, journeys, family plans and public calendars across the UAE, including for residents who do not observe them religiously. Ramadan can change the rhythm of the day, with altered working patterns and more activity after sunset. Because lunar dates are confirmed nearer the occasion, treat early holiday entries as planning markers and follow the final UAE announcement before relying on them.
Common questions
Why is the Hijri year shorter than the Gregorian year?
It contains twelve lunar months of 29 or 30 days, producing a year of 354 or 355 days. A Gregorian year follows the solar cycle and lasts 365 or 366 days.
Why does Ramadan begin on a different Gregorian date each year?
The Hijri year is roughly eleven days shorter than the Gregorian year, so Ramadan moves earlier through the solar calendar. Its final start is confirmed through the relevant moon-sighting process.
Can a Hijri date differ by one day between calendars?
Yes. Some calendars use calculated month lengths, while official religious dates may depend on crescent observation and a subsequent announcement.
What does AH mean after a Hijri year?
AH abbreviates Anno Hegirae, meaning in the year of the Hijra. It identifies a year counted from the Islamic era associated with the migration in 622 CE.
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