The Chronological Old Testament

I don't pretend to be an Old Testament expert by any means, but to my limited knowledge the categorizing method of organizing the books of the Old Testament is chronological for the most part.

Bear in mind that very few of the dates these books were written are absolutely known:

The Pentateuch:

Genesis (c. 1450 – 1410 B.C.)
Exodus ( c. 1450 – 1410 B.C.)
Leviticus ( c. 1445 – 1444 B.C.)
Numbers (c. 1450 – 1410 B.C.)
Deuteronomy (c. 1407 – 1406 B.C.)

The Historic Books:

Joshua (c. 1380 B.C.)
Judges ( unknown, c. 1000 B.C.?)
Ruth (c. 1375 – 1050 B.C. ?)
1 Samuel (unknown, c. 1000 B.C. ?)
2 Samuel (c. 1050 – 970 B.C.)
1 Kings (c. 562 B.C. ?)
2 Kings ( c. 562 B.C.)
1 Chronicles (430 B.C. [referring to events c. 1000 – 960])
2 Chronicles (430 B.C. [referring to events c. 970 – 586])
Ezra (430 [referring to events c. 538 – 430])
Nehemiah (420 B.C.)
Esther (c. 470 B.C. ?)

Books of Poetry:

Job (unknown, est. 2000 – 1800 B.C.)
Psalms (c. 1440 – 586 B.C.)
Proverbs (c. 960 B.C. ?)
Ecclesiastes (935 B.C. ?)
Song of Songs (960 B.C. ?)

Major Prophets:

Isaiah (700 – 681 B.C.)
Jeremiah (627 – 586 B.C.)
Lamentations (c. 586 B.C.)
Daniel (c. 535 B.C. [referring to events c. 605-535])

Minor Prophets:

*Hosea (c. 715 B.C. [referring to events c. 753-715])
Joel (835 – 796 B.C.)
Amos (c. 760 – 750 B.C.)
*Obadiah (c. 586 B.C.)
Jonah (785 – 760 B.C.)
Micah (742 – 687 B.C.)
Nahum (663-654 B.C.)
Habakkuk (612 – 589 B.C.)
Zephaniah (640 – 621B.C.)
Haggai (520 B.C.)
Zechariah (520 – 480 B.C.)
Malachi (430 B.C.)

With the apparent exceptions of Hosea and Obediah I would say it is in chronological order.

Why is the New Testament not in chronological order?