1. To convert UTC(Coordinated Universal Time) to Local timezone

func convertToLocalDateFromUTCDate(dateStr : String) -> String {
        let formatter = DateFormatter()
        formatter.dateFormat = "yyyy-MM-dd HH:mm:ss Z"
        let sourceDate = formatter.date(from: dateStr)
        let formatter2 = DateFormatter()
        formatter2.dateFormat = "MMM dd @hh:mm aa"
        let localTime = formatter2.string(from: sourceDate!)
        print("local time %@",localTime)
        return localTime
    }

2.To convert Local timezone to UTC(Coordinated Universal Time)

func convertToUTCFromLocalDate(dateStr : String) -> String {
        let formatter = DateFormatter()
        formatter.dateFormat = "MMM dd @hh:mm aa"
        let utc = NSTimeZone(abbreviation: "UTC")
        formatter.timeZone = utc as TimeZone!
        formatter.dateFormat = "MMM dd @hh:mm aa"
        let localDate: Date? = formatter.date(from: dateStr)
        let timeZoneOffset: TimeInterval = TimeInterval(NSTimeZone.default.secondsFromGMT())
        let utcTimeInterval: TimeInterval? = (localDate?.timeIntervalSinceReferenceDate)! - timeZoneOffset
        let utcCurrentDate = Date(timeIntervalSinceReferenceDate: utcTimeInterval!)
        print(UTC time %@",utcCurrentDate)
        return formatter.string(from: utcCurrentDate)
    }