Some Time Ago.swift

import Foundation

extension Date {
    func timeAgoString() -> String {
        let units = Array<Calendar.Component>([.year, .month, .day, .hour, .minute, .second])
        let components = Calendar.current.dateComponents(Set(units), from: self, to: Date())
        
        for unit in units
        {
            guard let value = components.value(for: unit) else {
                continue
            }
            
            if value == 1 {
                return "\(value) \(unit) ago"
            } else if value > 1 {
                return "\(value) \(unit)s ago"
            }
        }
        
        return "some time ago"
    }
}

let date: Date! = DateComponents(calendar: Calendar.current, year: 2020, month: 5, day: 9, hour: 9, minute: 55).date

print(date.timeAgoString())