比较2格式化的NSDate

Question

我希望以这种格式与日期合作：＆＃34; dd / MM / yyyy＆＃34;

第一个是实际日期，另一个是从Data Core请求，但是当我想比较2个日期是否等于时，我的格式错误：

    let dateString = NSDate().dateToString(format:"dd/MM/yyyy")

    Params.insertValueWithKey(context: context, key: "simulationDate", value: dateString)

    let paramsDateString = Params.getValueFromKey(context: context, key: "simulationDate")

    let paramsDate = NSDate().stringToDate(dateString:paramsDateString, format:"dd/MM/yyyy")



    if NSDate() as Date != paramsDate {
        let actualDate = DateFormatter().string(from: NSDate() as Date)

        Params.insertValueWithKey(context: context, key: "simulationData", value: actualDate)
    }

功能：

extension NSDate {
    func dateToString(format: String) -> String {
        var dateFormatter = DateFormatter()
        dateFormatter.dateFormat = format
        var dateString = dateFormatter.string(from: self as Date)
        return dateString
    }

    func stringToDate(dateString: String, format: String?) -> Date{
        var dateFormatter = DateFormatter()
        dateFormatter.dateFormat = format
        var date = dateFormatter.date(from: dateString)
        return date!
    }
}