There is no specific date. It will not be about Nevada. It will be about the laws of the new state and the totality of your intentions shown. If the question ever came up, the new state, for example, could use the facts that you sold your NV property and bought a property in their state and moved into it even if on December 1st and would want to tax any income for that month in their state. The reason is you would be showing the intent to abandon NV as your resident state and establish the new state as your residence as of 1 December.
Most states use 183 days as one of the factors in determining residency in the their state; the other factors are items like I listed earlier.
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