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byDay

This term is proposed for full integration into Schema.org, pending implementation feedback and adoption from applications and websites.

Thing > Property > byDay

Defines the day(s) of the week on which a recurring Event takes place. May be specified using either DayOfWeek, or alternatively Text conforming to iCal's syntax for byDay recurrence rules
Values expected to be one of these types
DayOfWeek
Text
Used on these types
Schedule

Source

https://github.com/schemaorg/schemaorg/issues/1457