The sultanate's Ministry of Endowments and Religious Affairs said last Sunday that the holy month would fall on Thursday, May 17 due to concerns the moon would not be visible nationwide on Tuesday evening the next week.
Ramadan is a holy month for the world's almost 1.5 billion Muslims, many of whom practise the ritual of dawn-to-dusk fasting and prayers.
A new month in the Islamic Calendar is decided based on sighting of the crescent - the new moon, on the 29th day of an ongoing month.
The announcement was made by the Grand Mufti of Australia, Abdul Azim Al Afifi on the council's official Facebook page.
Sighting the crescent to determine when the holy month of Ramadan begins is not the only moonsighting which concerns Muslims.
Ramadan is a 30 day period of fasting recognizing the completion of the holy book by the Prophet Muhammad.
During Ramadan, Muslims fast from dawn to dusk each day.
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Many Muslims will try and recite as much of the Koran as they can during the month.
Redbridge CCG - the body in charge of what health services are provided in the borough - advise those fasting avoid spending long periods of time in the sun to stay healthy.
"In recognition of this, every year many of our embassies and consulates around the world host Ramadan activities bringing together Muslims and people of other faiths, who are committed to our shared goal of fostering peace, stability, and prosperity". So they said that Ramadan will start from 17th of May.
Fasting is meant to bring the faithful closer to God and remind them of those less fortunate. Previous year more accidents happened in the late morning rush hour between 10am and 11am than any other time.
The common greetings during the month is "Ramadan Mubarak" and "Ramadan Kareem", wishing the recipient a "blessed" and generous Ramadan.
Here's everything you need to know about Ramadan, when does Ramadan end and what is Eid al-Fitr?
On the day, Muslims attend a special prayer in the morning at outdoor locations or mosques.
After that, the standard follow is to adjourn for prayer after which the primary meal is served.