Islamic Calendar

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1st day of Ramadan 1442 AH: Tuesday, April 13, 2021 (Starting evening of Monday, Apr 12)

Eidul-Fitr 1442 AH: Thursday, May 13, 2021
Eidul-Adha 1442 AH: Tuesday, July 20, 2021 (The day following the day of ‘Arafah’)

Reference:
http://moonsighting.com/ramadan-eid.html

The Islamic Calendar with Gregorian Dates

https://www.moonsighting.com/2020fcna.html

On Friday, Oct 4, 2019, Members of Islamic Society of Belleville expressed their preference on the selection of Islamic (Hijri) Calendar. Majority of brothers and sisters expressed willingness to adapt Scientific Calendar for Important Islamic dates.

Astronomical method of calculating lunar cycles and Hijri dates has been adopted by the ‘Fiqh Council of North America‘ and major mosques and Islamic Centers in North America.
More information on the calculations: https://www.moonsighting.com/