READ MORE: Muslim Severn Trent worker designs first PPE headscarf after safety worriesīasing the Islamic calendar on the moon means it can be predicted in advance but in practice, a sighting of the first crescent of the new moon is confirmed before the start of each month is known and other dates within that month can then be determined. It means that Islamic dates fall 10 or 11 days earlier in each regular western year. This lunar calendar is 10 to 11 days shorter than the solar-based Gregorian calendar followed by much of the western world. The Islamic calendar - also called the Hijri calendar - is based on the cycle of the moon and consists of 12 months in a year of 354 or 355 days. So when are they? And how are they worked out? It's not yet known how they may be impacted by coronavirus restrictions in the ongoing pandemic.īut it's still necessary to know the dates. We are now in year 1443 of the Islamic calendar and events such as Ramadan, Eid and the Hajj pilgrimage will be coming round once again.