Adonijah in the Bible Encyclopedia - ISBE
ad-o-ni'-ja ('adhoniyahu or 'adhoniyah, "my lord is
(1) The son of David and Haggith, the forth of David's sons,
born in Hebron after David became king of Judah, principally
known for his attempt to become king instead of Solomon (2
Sam 3:4; 1 Ch 3:2; 1 Ki 1 and 2). The record gives no
details concerning Chileab, the son of David and Abigail.
Leaving him out, Adonijah was the oldest living son of
David, after the death of Amnon and Absalom.
In treating the record it has been needlessly obscured by
neglecting or distorting the time data. It says that the
rebellion of Absalom broke out "at an end of forty years" (2
Sam 15:7). The natural meaning is not forty years after the
last-mentioned preceding date, but at the close of the
fortieth calendar year of the reign of David. Since David
reigned 40 1/2 years (2 Sam 5:4,5), the close of his
fortieth calendar year was the beginning of has last year.
That the date intended was at the beginning of a vernal year
is confirmed by the references to the season (2 Sam
17:19,28). Instead of giving this number Josephus says that
4 years had elapsed since the last preceding date, which is
very likely correct...