Amajida S. The Systematic Implications of the Hijri Calendar in the Caliph Umar bin Khattab’s Period for the Present. AFAQ [Internet]. 2025 Jun. 5 [cited 2026 Apr. 22];7(1):57-66. Available from: https://journal.uinmataram.ac.id/index.php/afaq/article/view/11449