Check where you are in the current Hijri month and see the two standard possible dates the next Hijri month could begin, based on the 29/30-day lunar month rule used in moon-sighting.
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A Hijri month follows the moon's roughly 29.5-day cycle from one new crescent to the next, which means every Islamic month is either 29 or 30 days long — never more, never less. Traditionally, on the evening of the 29th day, observers look for the new crescent moon (hilal) low on the western horizon just after sunset. If it is sighted, the new month begins the very next day. If it is not sighted — whether because of cloud cover, atmospheric conditions, or because the crescent genuinely has not yet formed enough to be visible — the current month is simply extended to a full 30 days, and the new month begins the day after that instead, with no need for further observation. This tool applies that same universally recognized 29/30-day rule to the tabular (calculated) Hijri date for whichever Gregorian date you check, showing both of the two possible Gregorian dates the next month could begin on. It does not attempt to predict actual crescent visibility itself, since that determination is officially made by moon-sighting committees and religious authorities using real observation or, in some countries, pre-calculated astronomical tables.
Every new Hijri month arrives with a small, recurring question for much of the Muslim world: did anyone see the moon last night? Unlike the Gregorian calendar, where every month has a fixed, predetermined number of days known years in advance, the Islamic calendar's months are tied directly to the moon's actual cycle — and that cycle carries a small but meaningful amount of built-in uncertainty right up until the final evening of each month.
The moon takes approximately 29.5 days to travel from one new moon to the next, which means a lunar month can only ever be 29 or 30 days — there is no third option. This is where the practice known as moon sighting, or hilal observation, comes in. On the evening of what would be the 29th day of the current month, observers traditionally look toward the western horizon shortly after sunset, searching for the faint, thin crescent of the new moon low in the sky. If it's spotted, that observation confirms the current month has ended at 29 days, and the new month begins the very next day.
But the crescent isn't always visible on schedule, even when it has technically formed. Cloud cover, haze, a low position relative to the horizon, or simple daylight lingering too long can all prevent a successful sighting on the 29th evening, regardless of the moon's actual age. When that happens, there's no need for panic or further searching: the current month simply runs its full course to 30 days by default, and the new month begins the day after that, no additional confirmation required. This built-in safety valve is exactly why a Hijri month can never be shorter than 29 days or longer than 30 — the calendar resolves itself automatically either way.
Different countries and religious authorities handle the confirmation process differently. Some rely on local or national committees who physically attempt to observe the crescent each month, sometimes coordinating across a wide geographic area. Others use pre-calculated astronomical tables — predicting when and where the crescent should theoretically become visible — to announce the start of a month in advance without waiting for direct observation on the night itself. Both approaches are used across various Muslim-majority countries, and the choice between them is a matter of ongoing discussion among religious and astronomical authorities rather than a settled, universal standard.
This tool doesn't attempt to referee that discussion or predict actual crescent visibility for your location, since that depends on precise astronomical variables well beyond a simple calendar conversion. It applies the same universal 29/30-day rule to a tabular Hijri date, so you can see where you stand in the current month and which dates are in play for the next one, while leaving the actual confirmation to your local mosque or national Islamic authority.
No. It shows the calculated (tabular) Hijri date and the two standard possible dates the next month could begin, based on the 29/30-day lunar month rule. The final, confirmed date is announced by your local moon-sighting authority.
The moon takes roughly 29.5 days to complete a full cycle, so every lunar month naturally falls at either 29 or 30 days — there is no shorter or longer option in the Islamic calendar.
This varies by country. Many rely on a local or national moon-sighting committee that observes the sky directly, while some countries use pre-calculated astronomical criteria instead. Both approaches exist across different Muslim-majority countries.
It refers to a fixed mathematical calendar algorithm (used consistently across this website) that assigns a predictable pattern of 29- and 30-day months, as distinct from a date confirmed by an actual crescent sighting on a specific evening.
Yes. Because the crescent's visibility depends on your location on Earth and local weather conditions, and because countries use different sighting or calculation methods, the announced start of a Hijri month can genuinely differ by a day between countries.