Muslims prepare for Ramadan, a month of fasting, prayer, and reflection, starting at sunset Friday and ending March 30. Follow Newsweek's live blog.

However, unlike other religious holidays, Ramadan doesn't start on the same day each year. This is because the Islamic calendar follows the moon's cycle. And what can be even more confusing is that different groups might give slightly different dates for when Ramadan starts,

The crescent moon has been sighted in Saudi Arabia, with Roza starting from Saturday. In India, Roza begins from Sunday. Japan, Indonesia, Philippines, New Zealand and Australia have also announced the dates for Ramadan.