Lunar months are either 29 or 30 days long, so Muslims typically have to wait until the night before Eid to confirm its date.
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For countries that started Ramadan on March 24, local moon sighters will scan the horizon after sunset on Friday, April 21, to search for the crescent moon.
If the new moon is visible (called Chaand Raat), then Eid will be celebrated the following day. Otherwise, Muslims will fast for one more day to complete the 30-day month.
Muslims are on the lookout for the moon as it might be out, either on Friday, April 21st or Saturday, April 22nd this year.
But this will depend on the number of fast that was observed according to the Islamic lunar calendar.
So, if this year's month of Ramadan ends in 30 days, it means Saturday, April 22nd of Ramadan is Salah, BBC Pidgin reported.