The Hijri Calendar (Islamic Calendar) is a lunar calendar used by Muslims worldwide to determine Islamic events such as Ramadan, Hajj, and Eid. Unlike the Gregorian Calendar, which follows the solar year, the Hijri Calendar follows the moon’s cycle.

This guide explains how to use the Hijri Calendar tool, how the date adjustment feature works, and how you can keep your dates accurate.

🔹 Difference Between Hijri and Gregorian Calendars

Feature	Hijri Calendar (Islamic)	Gregorian Calendar (Western)
Basis	Lunar (moon cycle)	Solar (sun cycle)
Months	12 months, 29–30 days	12 months, 28–31 days
Year length	~354 or 355 days	365 or 366 days
Start year	622 CE (Hijra of Prophet Muhammad ﷺ)	1 CE (Birth of Christ)
Usage	Islamic rituals/events	Global civil calendar

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🔹 Why Do Hijri Dates Shift?

The Hijri calendar depends on the sighting of the moon. Sometimes, the calculated Hijri date may be ahead or behind the observed date in your region.

For example:

• Your calendar shows 26 Safar 1447 – 19 August 2025 (Tuesday).
• But locally, the mosque announces 24 Safar 1447 – 19 August 2025 (Tuesday).
• The Gregorian date and weekday remain the same, but the Hijri date needs adjusting.

This is why the Adjust Date function exists.

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🔹 Using the “Adjust Date” Function

The Adjust Date button/link allows you to manually synchronize the Hijri calendar with the official moon-sighting announcements in your country.

🛠 How It Works

1. Click on the Adjust Date button.
2. A prompt will appear asking you to enter today’s Hijri date (year, month, day).
3. The tool will re-align the Hijri calendar with your input.
4. The Gregorian date and weekday do not change — only the Hijri date shifts.

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🔹 Example of Date Adjustment

Before Adjustment	After Adjustment
26 Safar 1447 – 19 Aug 2025 – Tue	24 Safar 1447 – 19 Aug 2025 – Tue

✅ Notice how the Hijri date is corrected, but the Gregorian date and weekday remain unchanged.

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🔹 Benefits of Date Adjustment

✔ Ensures your Hijri calendar matches your local moon sighting.
✔ Keeps Islamic events and rituals accurate.
✔ Prevents confusion between Gregorian and Hijri dates.
✔ Easy to use — just one click and enter the correct Hijri date.

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🔹 Quick Tips for Users

• Always check your local mosque or Islamic authority for official moon-sighting updates.
• Use the Adjust Date function at the start of each new Hijri month if required.
• Remember: The day and Gregorian date will stay fixed — only the Hijri date shifts.

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🔹 Conclusion

The Hijri Calendar with Adjust Date feature is a powerful tool that helps Muslims keep their schedules aligned with both Gregorian dates and Islamic months.

With this function, you can always ensure that your Ramadan, Hajj, Eid, and other important days match the official lunar calendar observed in your community.

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