Convert Date To Readable String.swift

extension Date {
    func convertDateToReadableString() -> String {
        let todayString = "Today"
        let yesterdayString = "Yesterday"

        /// Initializing a Date object will always return the current date (including time)
        let todaysDate = Date()

        guard let yesterday = todaysDate.subtract(days: 1) else { return "2023" }
        guard let oneWeekAgo = todaysDate.subtract(days: 7) else { return "2023" }
        guard let dayBeforeYesterday = yesterday.subtract(days: 1) else { return "2023" }

        /// This will be any date from one week ago to the day before yesterday
        let recently = oneWeekAgo ... dayBeforeYesterday

        /// convert the date into a string, if the date is before yesterday
        let dateFormatter = DateFormatter()

        /// If self (the date that you're comparing) is today
        if Calendar.current.isDateInToday(self) {
            return todayString

            /// if self is yesterday
        } else if Calendar.current.isDateInYesterday(self) {
            return yesterdayString

            /// if self is in between one week ago and the day before yesterday
        } else if recently.contains(self) {
            /// "EEEE" will display something like "Wednesday" (the weekday)
            dateFormatter.dateFormat = "EEEE"
            return dateFormatter.string(from: self)

            /// self is before one week ago
        } else {
            /// displays the date as "January 1, 2020"
            /// the ' ' marks indicate a character that you add (in our case, a comma)
            dateFormatter.dateFormat = "MMMM d"
            return dateFormatter.string(from: self)
        }
    }

    func add(years: Int = 0, months: Int = 0, days: Int = 0, hours: Int = 0, minutes: Int = 0, seconds: Int = 0) -> Date? {
        let comp = DateComponents(year: years, month: months, day: days, hour: hours, minute: minutes, second: seconds)
        return Calendar.current.date(byAdding: comp, to: self)
    }

    func subtract(years: Int = 0, months: Int = 0, days: Int = 0, hours: Int = 0, minutes: Int = 0, seconds: Int = 0) -> Date? {
        return add(years: -years, months: -months, days: -days, hours: -hours, minutes: -minutes, seconds: -seconds)
    }
}