The date that the property was advertised and available for a renter to move in is the date that you placed it in service as a rental property. Based on your information, that date is probably 8/22 since you said that is when it was 'on the market'.
The reason your personal use is zero days is because the property was not considered a rental property when you were using it for personal purposes. The question is asking about any personal use days after the property became a rental property. You would only enter a number for personal use days if you used it personally after the date it was placed in service as a rental (for example, it is common to have personal use days for a vacation rental, but not for a long-term rental situation).
@lizshh
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