Swift 3.0:将服务器UTC时间转换为本地时间,反之亦然
我想将服务器UTC时间转换为本地时间,反之亦然。这是我的代码。
var isTimeFromServer = truevar time:String!
var period:String!
let timeString = "6:59 AM" //Current UTC time
if isTimeFromServer {
let index = timeString.index(timeString.startIndex, offsetBy: 5)
let twelve = timeString.substring(to: index)
var dateString:String!
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "H:mm"
let date12 = dateFormatter.date(from: twelve)!
dateFormatter.dateFormat = "h:mm a"
let date22 = dateFormatter.string(from: date12)
//print(date22)
dateString = date22
//print("dateString=\(dateString)")
time = dateString.components(separatedBy: " ")[0]
period = dateString.components(separatedBy: " ")[1]
}
else {
time = timeString.components(separatedBy: " ")[0]
period = timeString.components(separatedBy: " ")[1]
}
var hour = Int(time.components(separatedBy: ":")[0])
hour = period == "AM" ? hour : hour! + 12
let minute = Int(time.components(separatedBy: ":")[1])
let calender = NSCalendar.current
var datecomponent = DateComponents()
datecomponent.calendar = calender
datecomponent.hour = hour
datecomponent.minute = minute
if !isTimeFromServer {
// local to UTC
datecomponent.timeZone = TimeZone.current
}
else {
datecomponent.timeZone = TimeZone(abbreviation: "UTC")
}
let date = datecomponent.date
let dateFormatter = DateFormatter()
if !isTimeFromServer {
dateFormatter.dateFormat = "H:mm"
dateFormatter.timeZone = TimeZone(abbreviation: "UTC")
dateFormatter.string(from: date!)
}
else {
//UTC to local
dateFormatter.dateFormat = "h:mm a"
dateFormatter.timeZone = TimeZone.current
dateFormatter.string(from: date!)
}
我知道当地时间
o / p:“下午12:52”
但是实际的本地时间和输出时间相差23分钟。
回答:
我不知道您的代码有什么问题。
但是看起来有太多不必要的事情,就像您要设置日历,从字符串中获取某些元素一样。这是我的UTCToLocal和localToUTC函数的小版本。
但是为此,您需要以特定格式传递字符串。原因我已强制打开日期对象。但是您可以使用一些保护条件来防止应用程序崩溃。
func localToUTC(date:String) -> String { let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "h:mm a"
dateFormatter.calendar = NSCalendar.current
dateFormatter.timeZone = TimeZone.current
let dt = dateFormatter.date(from: date)
dateFormatter.timeZone = TimeZone(abbreviation: "UTC")
dateFormatter.dateFormat = "H:mm:ss"
return dateFormatter.string(from: dt!)
}
func UTCToLocal(date:String) -> String {
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "H:mm:ss"
dateFormatter.timeZone = TimeZone(abbreviation: "UTC")
let dt = dateFormatter.date(from: date)
dateFormatter.timeZone = TimeZone.current
dateFormatter.dateFormat = "h:mm a"
return dateFormatter.string(from: dt!)
}
然后像下面这样调用这些函数。
print(UTCToLocal(date: "13:07:00"))print(localToUTC(date: "06:40 PM"))
希望这会帮助你。
编码愉快!!
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