Okay here's me elaborating(although this is still somewhat theory as I haven't researched or actually tried to code it yet):
Season: Alternates only available during a certain 3 months of the year. December/January/February - March/April/May - June/July/August - September/October/November
Date: Alternates only available ON or between specified dates. :3 This could probably be like only on the 13th of the month, or only during December every year, or ONLY for 1 week ever.
Time: Available only during day/night or only available at noon-1pm or midnight-1am, that kind of thing.
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