[Day in a week] gets a specific day in a week #Swift #Date

dateInWeek.swift

import Foundation

/**
    Gets a specific day in a week of a given date
    - parameters:
        - dayNumber: One day of the week, being 1 for Sunday until 7 for Saturday
        - of: Date to work
        - format: Output format desired
*/
extension Date {
    static func dayInWeek(dayNumber: Int, of givenDate: Date, format: String) -> String {
        let calendar = Calendar.current
        
        var comps = calendar.dateComponents([.weekOfYear, .yearForWeekOfYear], from: givenDate)
        comps.weekday = dayNumber

        let dayInWeek = calendar.date(from: comps)!

        let formatter = DateFormatter()
        formatter.dateFormat = format
        formatter.timeZone = TimeZone.current

        return formatter.string(from: dayInWeek)
    }
}