For purposes of this part, in the case of a nonresident or part-year resident, the term “California adjusted gross income” includes each of the following:

1. (a) For any part of the taxable year during which the taxpayer was a resident of this state (as defined by Section 17014), all items of adjusted gross income, regardless of source.
2. (b) For any part of the taxable year during which the taxpayer was not a resident of this state, adjusted gross income derived from sources within this state, determined in accordance with Article 9 (commencing with Section 17301) of Chapter 3 and Chapter 11 (commencing with Section 17951).