Chance of buyer depends on what animals you have in the medium pens. If you don't have any, it will always spawn Ralph. Buyers can be "forced" by only having one type of medium animal within a pen when you reset for the day or by placing an advert for a specific one.
Note that the calendar automatically converts it to your timezone. For example, if it changes at reset on the 16th, which is 7PM on the 15th for me, the calendar will list the 15th when I look at it.
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