我尝试在我的 Swift4 代码中获取 CEST 时区的实际时间
,格式如下 "HH:mm" // needed in CEST TimeZone (CEST = Central European Summer Time)
在尝试这样做时,我观察到两种奇怪的行为(请参阅下面的代码...(:
1.( 当时区标识符设置为 CEST --> 时,收到的 HH:mm 是完全错误的(并且采用 UTC 而不是预期的 CEST 时区(
2.( 当时区标识符设置为"CET"(而不是 CEST(时 --> 那么一切正常!(即接收到的 HH:mm 时间是正确的 CEST 时间(令人惊讶的是 - 它不在预期的 CET 时区中,而是在 CEST 时区(
我在测试期间设置的 iPhone 时区设置为 PDT (= UTC-7(...但其他时区也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)
}
}
我已经更新了你的代码。请看一看:
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