Hours ago text for chat time labels + Swift

Dates+Extension.swift

extension Date {
    func differenceFromNow() -> DateComponents {
        return Calendar.current.dateComponents([.year, .month, .day, .hour, .minute], from: self, to: Date())
    }
}

extension DateComponents {
    func agoString() -> String {
        if let year = year, year > 0 {
            return "\(year) \(year > 1 ? "years" : "year") ago"
            
        } else if let month = month, month > 0{
            return "\(month) \(month > 1 ? "months" : "month") ago"
            
        } else if let days = day, days > 0 {
            if days > 7 {
                let weeks: Int = days/7
                return "\(weeks) \(weeks > 1 ? "weeks" : "week") ago"
            }
            return "\(days) \(days > 1 ? "days" : "day") ago"
            
        } else if let hour = hour, hour > 0 {
            return "\(hour) \(hour > 1 ? "hours" : "hour") ago"
            
        } else if let minute = minute, minute > 0 {
            return "\(minute) \(minute > 1 ? "minutes" : "minute") ago"
            
        } else {
            return "now"
        }
    }
}

usage example:

let string = "16:36 Wed, 13 Jun 2021"
let formatter = DateFormatter()
formatter.dateFormat = "HH:mm E, d MMM y"
guard let oldDate = formatter.date(from: string) else { return }
print(oldDate.differenceFromNow().agoString())

Output sample:
12 minutes ago