Table 1. Chronology of the Kings of Israel.

Column 5 has the king’s start and end dates (in Nisan/Tishri notation) that were used by the court recorders in determining the length of the king’s reign. Column 6 has the elapsed years based on those start and end dates. When there are two figures in column 6, this indicates that the reign length given in Scripture (the first figure) is by non-accession counting. The comparison of column 5 with the beginning and ending dates and with column 6 shows that the court recorders of Israel always kept in mind the official starting year of a king and were exact in all their representations of his reign length.
KingOverlapping
reigns
Began
sole reign

Ended
Official
start and end
Years
reigned
Jeroboam I
Nadab
Baasha
931n
910t/909n
909t/908n
910t/909n
909t/908n
886t/885n
931n - 910n
910n - 909n
909n - 886n
22 (21)
2 (1)
24 (23)
Elah
Zimri
Tibni
886t/885n
885t/884n
885t/884n
885t/884n
885t/884n
880n/880t
886n - 885n
885n
885n - 880n
2 (1)
7 days
(not stated)
Omri
Ahab
Ahaziah
885t/884n
 
 
880n/880t
874t/873n
853n/853t
874t/873n
853n/853t
852n/852t
885n - 874n
874n - 853n
853n - 852n
12 (11)
22 (21)
2 (1)
Joram
Jehu
Jehoahaz
852n/852t
841n/841t
814t/831n
841n/841t
814t/813n
798n/798t
852n - 841n
841n - 814n
814n - 798n
12 (11)
28 (27)
17 (16)
Jehoash
Jeroboam II
Zechariah
 
793n
 
798n/798t
782t/781n
753, Elul
782t/781n
753, Elul (Sep)
752, Adar (Mar)
798n - 782n
793n - 753n
753n - 753n
16
41 (40)
6 mo.
Shallum
Menahem
Pekahiah
752, Adar
752, Nisan
742t/741n
752, Nisan (Apr)
742t/741n
740t/739n
753n - 752n
752n - 742n
742n - 740n
1 mo.
10
2
Pekah
Hoshea
752, Nisan
 
740t/739n
732t/731n
732t/731n
723n/723t
752n - 732n
732n - 723n
20
9
Explanation of the "Nisan/Tishri" notation used in these tables
931nThe year beginning on the first of Nisan (a spring month) of 931 BC. Regnal years were reckoned from Nisan 1 in Assyria, Babylonia, and Israel.
931tThe year beginning on the first of Tishri of 931 BC. Tishri is a fall month, 6 months later than Nisan. Regnal years were reckoned from Tishri 1 in Judah. Sabbatical years started on Tishri 1. Jubilee years started on Tishri 10.
931n/931tThe six-month period beginning Nisan 1 of 931 BC.
931t/930nThe six-month period beginning Tishri 1 of 931 BC.