The holy month of Ramadan is almost upon us, with Muslims around the world preparing to observe the fast which characterises the festival. A gruelling process at the best of times, the prolonged period of abstinence can also be confusing because fasting times are based on sunrise and sunset, and so change each day as Ramadan progresses.
This means that this year's fasting period will get longer each day, with the days gradually lengthening as summer approaches.
Here are the key dates and a guide to fasting times for worshippers around the UK throughout the holy month.
When does Ramadan 2022 start?
Like other Muslim festivals, the festival of Ramadan is based on the lunar calendar, which means its position in the more widely used Gregorian calendar moves slightly.
As the charity Muslim Aid explains: "The Islamic calendar follows the phases of the moon, commonly known as the lunar cycle. As a result, the Holy month of Ramadan falls approximately 10 days earlier each year in the Gregorian calendar."
The month begins with the sighting of the crescent moon, which generally appears one night after the new moon.
This year, Ramadan is expected to start on Saturday 2 April, although it could come a day later if the moon isn't sighted.
It lasts between 29 and 30 days until the sighting of the next crescent moon marks the end of the holy month and the arrival of Shawwal, the tenth month of the Islamic Hijri calendar.