Cairo - Muslims across the world will be greeting each other by saying "Eid Mubarak" in June, when the month-long fast of Ramadan comes to a close. Because the timing of Eid al-Fitr is based on the Islamic lunar calendar, it can be difficult to predict when the festival will take place.
But when the new moon appears over Saudi Arabia, the Islamic community break into colourful celebrations, throwing food festivals, performing music and spending time with friends and family.
Here's a guide to Eid al-Fitr, and how to know when it takes place.