[Solved] Getting the first date from what a user has selected

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First you need to create an enumeration for the weekdays:

extension Date {
    enum Weekday: Int {
        case sunday = 1, monday, tuesday, wednesday, thursday, friday, saturday
    }
}

Second create an extension to return the next weekday desired:

extension Date {
    var weekday: Int {
        return Calendar.current.component(.weekday, from: self)
    }
    func following(_ weekday: Weekday) -> Date {
        // **edit**
        // Check if today weekday and the passed weekday parameter are the same
        if self.weekday == weekday.rawValue {
            // return the start of day for that date
            return Calendar.current.startOfDay(for: self)
        }
        // **end of edit**
        return Calendar.current.nextDate(after: self, matching: DateComponents(weekday: weekday.rawValue), matchingPolicy: .nextTime)!
    }
}

Now you can use your method as follow:

let now = Date()

now.following(.sunday)    // "Mar 10, 2019 at 12:00 AM"
now.following(.monday)    // "Mar 11, 2019 at 12:00 AM"
now.following(.tuesday)   // "Mar 12, 2019 at 12:00 AM"
now.following(.wednesday) // "Mar 6, 2019 at 12:00 AM"
now.following(.thursday)  // "Mar 7, 2019 at 12:00 AM"
now.following(.friday)    // "Mar 8, 2019 at 12:00 AM"
now.following(.saturday)  // "Mar 9, 2019 at 12:00 AM"

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solved Getting the first date from what a user has selected