Question

我尝试以下列格式在Swift4代码中获取CEST-Timezone的实际时间

"HH:mm" // needed in CEST TimeZone (CEST = Central European Summer Time)

我尝试这样做时有两种奇怪的行为（参见下面的代码......）：

1。）当TimeZone-identifier设置为CEST时 - >然后收到的HH：mm是完全错误的（而且是在UTC中而不是预期的CEST时区）

2.）当TimeZone-Identifier设置为“CET”（而不是CEST）时 - >一切顺利！（即收到的HH：mm时间是正确的CEST时间（令人惊讶的是 - 它不在预期的CET时区，而是在CEST时区）

TimeZone我在测试过程中将我的iPhone设置为PDT（= UTC-7）......但是其他TimeZones确实显示了观察到的奇怪行为......

这是我的代码（请参阅CEST与CET设置）

let currentDate = Date()
let timeNowInCEST = currentDate.CurrentDate_to_CEST_timeOnlyString

在日期和字符串上使用以下扩展名：

extension Date {

    struct Formatter {
        static let CEST_TimeOnly_Formatter: DateFormatter = {
            let dateFormatter = DateFormatter()
            dateFormatter.dateFormat = "HH:mm"

            // ******** here I set the CEST or CET timezone
            // setting it to CEST delivers UTC
            // setting it to CET delivers CEST
            // (both are wrong - why is this strange behaviour ?????????????????)
            // **************************************************

            // dateFormatter.timeZone = TimeZone(identifier: "CEST")
            dateFormatter.timeZone = TimeZone(identifier: "CET")

            return dateFormatter
        }()
    }

    var CurrentDate_to_CEST_timeOnlyString: String {
        let CurrentDateString = Formatter.localFormatter.string(from: self)
        let CEST_Date = CurrentDateString.dateFromLocal
        let CEST_DateString = Formatter.CEST_TimeOnly_Formatter.string(from: CEST_Date!)
        return CEST_DateString
    }
}

extension String {

    struct Formatter {
        static let localFormatter: DateFormatter = {
            let dateFormatter = DateFormatter()
            dateFormatter.timeZone = TimeZone.current
            dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss"
            return dateFormatter
        }()
    }

    var dateFromLocal: Date? {
        return Formatter.localFormatter.date(from: self)
    }
}

Answer 1

我已更新您的代码。请看一下：

extension Date {

    static let CEST_TimeOnly_Formatter: DateFormatter = {
        let dateFormatter = DateFormatter()
        dateFormatter.dateFormat = "HH:mm"
        dateFormatter.timeZone = TimeZone(identifier: "CET")
        return dateFormatter
    }()

    var CurrentDate_to_CEST_timeOnlyString: String {
        let CEST_DateString = Date.CEST_TimeOnly_Formatter.string(from: self)
        return CEST_DateString
    }
}

根据区域获取时间：

let currentDate = Date()
let timeNowInCEST = currentDate.CurrentDate_to_CEST_timeOnlyString

CEST时间格式HH：mm

1 个答案: