It sounds like you do need to report the income received between December 28 and December 31.
Utah State Tax Commission defines part-year resident here:
"A part-year resident is a person who is a resident for part of the year and a nonresident for part of the year. All income received during the period of residency is taxable in Utah, regardless of where that income is earned, unless specifically exempted. Income from Utah sources is taxable in Utah during the period of nonresidency."
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