The holiday will begin this Thursday and run through June 15, which will be a day without fasting, marked by prayers and charitable donations to those in need.
Islamic months can be 29 or 30 days based on the appearance of the moon crescent at night.
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"Our Constitution ensures Muslims can observe Ramadan in accordance with the dictates of conscience and unimpeded by government", Trump said in a statement. But while some students can turn to food to help boost their brains and protect them from stress, that's not necessarily an option for the Muslim students around the world whose exams coincide with Ramadan, which begins this week.
Ramadan 2018 will begin in Saudi Arabia on Thursday, it has been announced.
A street staller sells cakes to celebrate the end of Ramadan, Eid al-Fitr, outside the East London Mosque, Whitechapel.
A man carrying children walks among traditional Ramadan lanterns called "fanous" displayed for sale at a stall, ahead of the Muslim holy month of Ramadan in Cairo, Egypt, May 6, 2018. It is on this night, which falls during the last 10 nights of Ramadan, that Muslims believe that God sent the Angel Gabriel to the Prophet Muhammad and revealed the first verses of the Quran.
Muslims continue with work and school during Ramadan, though they are encouraged to inform their employer or teacher of the fact. He also highlighted that there are many health benefits to fasting in Ramadan, as it allows for toxins in the body to be replaced.
During the entirety of Ramadan, which ends at sunset on the final day, Muslims do not eat, drink, have sex or smoke while the sun is up.
The faithful in Turkey, Albania, Bosnia and Herzegovina, Kosovo, Macedonia and others prayed the holy month's first taraweeh, a special nightly prayer and one of the hallmarks of Ramadan, on Wednesday.
Last minute preparations are underway as Muslims around the world stock up on groceries and dates for evening meals to break dawn-to-dusk fasting during the month of Ramzan.
Charity, also known as Zakat, is one of the pillars of Islam that promotes the sharing of wealth with the poor. The prayer consists of a sermon followed by the short congregational prayer.
Fasting is compulsory for grownup Muslims, besides those that are affected by an sickness, travelling, are aged, pregnant, breastfeeding, diabetic, chronically ailing or menstruating.