Gregorian to Hijri Date Converter — Islamic Calendar with Month Names | LazyTools

Islamic Calendar Tool

Gregorian to Hijri Date Converter — Islamic Calendar with Month Names

Convert any Gregorian calendar date to its Islamic Hijri equivalent. The result shows the Hijri day, month and year in both English and Arabic script, plus the Islamic significance of the month — whether it is Ramadan, Dhul Hijja, Muharram or another sacred month. Furthermore, the Hijri Month View tab shows all days in any Hijri month with their Gregorian equivalents side by side.

English & Arabic month namesMonth significance explainedHijri month calendar viewAll 12 Islamic monthsAccurate tabular algorithm

Gregorian date

How to use the Gregorian to Hijri Date Converter

Enter a Gregorian date

Click the date field and select any Gregorian date. Furthermore, the tool defaults to today, giving an immediate result for the current Hijri date without any input required.

Click Convert to Hijri

The result shows the Hijri date in numeric form (DD/MM/YYYY AH), English long form and Arabic month name. Furthermore, an insight panel at the bottom explains the Islamic significance of the current Hijri month.

Read the month significance

The insight panel describes the religious and cultural importance of the Hijri month containing your date. Furthermore, months such as Ramadan, Dhul Hijja and Muharram show specific key dates and observances that fall within them.

Switch to Hijri Month View

Click the Hijri Month View tab. Select a Hijri month and year, then click Show Month. Furthermore, the table lists every day in that Hijri month alongside its Gregorian calendar equivalent — useful for planning Islamic calendar events.

Use results for Islamic calendar planning

The Hijri month view covers the full range from 1300 to 1600 AH. Furthermore, note that this tool uses the tabular Islamic calendar — results are within 1–2 days of official moon sighting dates, which are confirmed annually by government authorities.

The twelve months of the Islamic calendar

The Hijri calendar has twelve lunar months. Each month begins with the sighting of the new crescent moon and lasts 29 or 30 days. Furthermore, the full year has either 354 or 355 days — approximately 11 days shorter than the Gregorian year. This means Islamic dates shift approximately 11 days earlier each Gregorian year.

Month	English name	Days	Key observance
1	Muharram	29–30	Islamic New Year; Ashura (10th)
2	Safar	29–30	—
3	Rabi Al-Awwal	29–30	Mawlid Al-Nabi — Prophet's birthday (12th, approx)
7	Rajab	29–30	Isra and Mi'raj (27th)
8	Shaaban	29–30	Preparation for Ramadan
9	Ramadan	29–30	Month of fasting; Laylat Al-Qadr (last 10 nights)
10	Shawwal	29–30	Eid Al-Fitr (1st)
12	Dhul Hijja	29–30	Hajj; Eid Al-Adha (10th)

The four sacred months

Islam designates four months as sacred (Al-Ashhur Al-Hurum): Muharram (1st), Rajab (7th), Dhul Qadah (11th) and Dhul Hijja (12th). Furthermore, warfare was forbidden in these months in pre-Islamic Arabian tradition, and this sanctity carries through in Islamic teaching. Moreover, acts of worship carry greater reward during these months, and transgression carries greater consequence.

How Gregorian dates are converted to Hijri

The conversion uses the tabular Islamic calendar — a mathematical approximation of the observational Islamic calendar. Furthermore, the algorithm converts the Gregorian date to a Julian Day Number (JD) and then maps it to the Hijri year, month and day using established arithmetic.

Gregorian → Julian Day Number → Hijri (year, month, day)

Epoch = 1 Muharram 1 AH = 16 July 622 CE (Julian) = 19 July 622 CE (Gregorian)
Hijri year = 30 × cycle + corrected remainder
Synodic month = 29.530589 days (mean lunar cycle)
Accuracy = within 1–2 days of astronomical moon sighting

Tabular versus observed Hijri dates

The tabular calendar is a mathematical calculation. The observed Hijri calendar — used for religious purposes in Saudi Arabia, UAE and most Muslim-majority countries — depends on physical moon sighting confirmed by official authorities. Furthermore, these two systems can differ by one day, particularly at the start of Ramadan and Eid. Always verify religious calendar dates with official government or religious authority announcements.

Worked example: converting a UAE National Day date

The UAE celebrates National Day on 2 December each year. What Hijri date corresponds to 2 December 2025?

Format	Value
Gregorian date	2 December 2025
Hijri date (numeric)	11/6/1447 AH
Hijri date (English)	11 Jumada Al-Thani 1447 AH
Hijri month	Jumada Al-Thani (6th month)
Day of week	Tuesday

UAE National Day 2025 falls in Jumada Al-Thani 1447 AH — the sixth month of the Islamic calendar. Jumada Al-Thani has no specific major Islamic observances, but it falls between the sacred months of Rajab and Dhul Hijja in the annual cycle.

How the Hijri year shifts each Gregorian year

The Hijri year is approximately 354 days long. Furthermore, this is 11 days shorter than the Gregorian year. As a result, Hijri dates shift approximately 11 days earlier each Gregorian year — completing a full cycle through the Gregorian calendar roughly every 33 years. Moreover, Ramadan, Eid and Hajj all follow this shifting pattern, which is why these dates fall at different Gregorian dates each year.

What is the Hijri calendar?

The Hijri calendar — also called the Islamic calendar or Al-Taqwim Al-Hijri — is a purely lunar calendar used across the Muslim world for religious purposes. Furthermore, the name "Hijri" refers to the Hijra — the Prophet Muhammad's (PBUH) migration from Mecca to Medina in 622 CE, which marks year 1 of the Islamic era (1 AH, Anno Hegirae).

Each Hijri month begins with the sighting of the new crescent moon — an observational event confirmed by religious authorities. Furthermore, the calendar has 12 months of 29 or 30 days, giving a year of 354 or 355 days. This is approximately 11 days shorter than the Gregorian year, causing Islamic dates to cycle through the full Gregorian calendar over a 33-year period.

Where the Hijri calendar is used

The Hijri calendar governs all Islamic religious observances — the timing of Ramadan, Eid Al-Fitr, Eid Al-Adha, the Hajj pilgrimage and other religious events. Furthermore, Saudi Arabia uses the Hijri calendar for official government dates alongside the Gregorian calendar. Moreover, most Muslim-majority countries use the Gregorian calendar for civil and commercial purposes while the Hijri calendar governs religious life.

The Hijri versus the solar Hijri calendar

The Hijri calendar described here is the observational lunar Islamic calendar used across the Arab world. Furthermore, Iran uses a different system — the Solar Hijri (Shamsi) calendar — which is a solar calendar also counted from the Hijra but aligned with the solar year. The Solar Hijri calendar does not drift through the seasons and has different month names and lengths. The Solar Hijri converter is available as a separate tool on LazyTools.

Why Gregorian to Hijri conversion matters

Business planning in the Gulf region requires Hijri calendar awareness. Ramadan significantly affects office hours, consumer behaviour and service availability. Furthermore, knowing when Ramadan begins in Gregorian terms — months in advance — allows businesses to plan campaigns, staffing and operational adjustments early. Moreover, Eid Al-Fitr and Eid Al-Adha are major national holidays across all GCC countries.

International organisations operating in the Gulf must account for Islamic calendar dates in project planning, contract deadlines and event scheduling. A product launch timed to coincide with the start of Ramadan requires a very different approach than one planned for after Eid. Furthermore, understanding which Hijri month contains a given Gregorian date is the first step in that planning.

How the month significance panel aids planning

The month significance panel describes the religious and cultural character of each Hijri month. Furthermore, this context is essential for marketing, event planning and communications teams operating in Muslim-majority markets. Advertising campaigns that run during Ramadan perform very differently from campaigns in Dhul Hijja. Moreover, content that acknowledges the spiritual character of the holy months builds authentic connection with Muslim audiences.

Frequently asked questions

How accurate is this Gregorian to Hijri conversion?▼

The tool uses the tabular Islamic calendar — a mathematical approximation based on the mean synodic month. Results are typically within 1 to 2 days of the observed Hijri date confirmed by official moon sighting. Furthermore, for religious calendar purposes — determining the start of Ramadan, Eid dates or the Hajj season — always defer to official government announcements from the relevant country's religious authorities, which may differ by one day from this calculation.

What is the current Hijri year?▼

The Hijri year in 2025–2026 CE is 1447 AH. Furthermore, the Hijri new year (1 Muharram) falls at a different Gregorian date each year because the Islamic year is approximately 11 days shorter than the Gregorian year. The tool always shows the current Hijri date when you open it, so you can check the exact year and month instantly.

What does "AH" mean in Islamic dates?▼

AH stands for Anno Hegirae — Latin for "Year of the Hijra". Furthermore, the Hijra refers to the migration of the Prophet Muhammad (PBUH) from Mecca to Medina in 622 CE. This event marks year 1 of the Islamic calendar. The designation AH is equivalent to CE (Common Era) or AD (Anno Domini) in the Gregorian system.

Why do Ramadan and Eid dates change each year?▼

The Islamic calendar is purely lunar and has 354 or 355 days per year. Furthermore, this is approximately 11 days shorter than the Gregorian year. As a result, all Islamic calendar dates shift approximately 11 days earlier in the Gregorian calendar each year. Over 33 years, this cycle brings each Islamic date through the complete Gregorian calendar. Ramadan, which is observed in the 9th Hijri month, has therefore fallen in every season of the Gregorian year over the past century.

Is this tool suitable for determining prayer times or Qibla direction?▼

No. This tool converts calendar dates only — it does not calculate prayer times or Qibla direction. Furthermore, prayer times depend on geographic location, the time of sunrise and sunset, and the specific calculation method used by the relevant religious authority. For prayer times, use a dedicated Islamic prayer time application or the official prayer schedule provided by your local mosque or government religious authority.

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