Hazrat Umar (RA) tenure of Khilafat was _____?

Hazrat Umar (RA) tenure of Khilafat was _____?

حضرت عمر رضی اللہ عنہ کا دور خلافت _____ تھا؟
Explanation

ʿUmar ibn al-Khaṭṭāb was the second Rashidun caliph, ruling from August 634 until his assassination in 644.