120 Days Notice of Non-Renewal: Refresher

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I need a refresher. In a hypothetical situation, if a Chicago landlord gave 120 days notice on 12/2/22 of non-renewal of a month-to-month tenancy, when is the move out date? (hypothetical 3 year + tenants)

1. 4/3/23

or 

2. 5/1/23

Can't remember if the last day of tenancy it automatically defaults to the first day of the next month, or if it can be in the middle of the month with a pro-rated payment.