Date+TimeAgo.swift

Date+TimeAgo.swift

extension Date {

    var timeAgo: String {
        let calendar = Calendar.current
        let now = Date()
        let earliest = self < now ? self : now
        let latest =  self > now ? self : now

        let unitFlags: Set<Calendar.Component> = [.minute, .hour, .day, .weekOfMonth, .month, .year, .second]
        let components: DateComponents = calendar.dateComponents(unitFlags, from: earliest, to: latest)

        let year = components.year ?? 0
        let month = components.month ?? 0
        let weekOfMonth = components.weekOfMonth ?? 0
        let day = components.day ?? 0
        let hour = components.hour ?? 0
        let minute = components.minute ?? 0
        let second = components.second ?? 0

        switch (year, month, weekOfMonth, day, hour, minute, second) {
        case (let year, _, _, _, _, _, _) where year >= 2: return L10n.timeagoYears(year)
        case (let year, _, _, _, _, _, _) where year == 1: return L10n.timeagoLastYear
        case (_, let month, _, _, _, _, _) where month >= 2: return L10n.timeagoMonths(month)
        case (_, let month, _, _, _, _, _) where month == 1: return L10n.timeagoLastMonth
        case (_, _, let weekOfMonth, _, _, _, _) where weekOfMonth >= 2:
            return L10n.timeagoWeeks(weekOfMonth)
        case (_, _, let weekOfMonth, _, _, _, _) where weekOfMonth == 1: return L10n.timeagoLastWeek
        case (_, _, _, let day, _, _, _) where day >= 2: return L10n.timeagoDays(day)
        case (_, _, _, let day, _, _, _) where day == 1: return L10n.timeagoLastDay
        case (_, _, _, _, let hour, _, _) where hour >= 2: return L10n.timeagoHours(hour)
        case (_, _, _, _, let hour, _, _) where hour == 1: return L10n.timeagoLastHour
        case (_, _, _, _, _, let minute, _) where minute >= 2: return L10n.timeagoMinutes(minute)
        case (_, _, _, _, _, let minute, _) where minute == 1: return L10n.timeagoOneMinute
    //  case (_, _, _, _, _, _, let second) where second >= 3: return "\(second) seconds ago"
        default: return L10n.timeagoJustNow
        }
    }
}