Represents one week day in a month. An example is "the 4th Sunday".
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dayOfWeek(type:String.t, default:nil) - Required. A day of the week. -
weekOrdinal(type:integer(), default:nil) - Required. Week number in a month. 1-4 indicates the 1st to 4th week of the month. -1 indicates the last week of the month.