O primeiro dia do Anno Hegirae 3 corresponde a 24 de Junho de 624 do calendário juliano, conforme Nicolas Lenglet Dufresnoy, Chronological Tables of Universal History (1762), Hegira of the Mahometans, p.308 [google books].
John Lanigan, An ecclesiastical history of Ireland, from the first introduction of Christianity to the beginning of the thirteenth century (1822), Chapter XVI, Of Ireland p.438 [google books]
