Reference for II Chronicles 36:2

בֶּן־שָׁל֧וֹשׁ וְעֶשְׂרִ֛ים שָׁנָ֖ה יוֹאָחָ֣ז בְּמָלְכ֑וֹ וּשְׁלֹשָׁ֣ה חֳדָשִׁ֔ים מָלַ֖ךְ בִּירוּשָׁלִָֽם׃

Joahaz was twenty and three years old when he began to reign; and he reigned three months in Jerusalem.

BDB