31 BE
From Bahaipedia
						
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31 BE was the 12th year of the 2nd váḥid of the 1st kull-i-shay’ of the Bahá'í Era, and the 31st year of the 1st century of the Bahá'í Era. 31 BE corresponds to the period between Naw-Rúz of 1874 and Naw-Rúz of 1875 of the Common Era (CE) according to the Gregorian calendar.