Decodes Unix time in Time that has a significance

Converts Unix time in Date.swift

func decodeDatefrom(_ unixTime: String) -> String? {
        
        // converts comment date into meaningful date
        var decodedDate: String?
        
        if let unixTime = Double(unixTime) {
            let dateFormatter = DateFormatter()
            let date = Date(timeIntervalSince1970: unixTime)
            dateFormatter.dateFormat = "dd.MM.yyyy"
            decodedDate = dateFormatter.string(from: date)
        }
        return decodedDate
    }