[英]Convert NSDate to String with a specific timezone in SWIFT
In my coredatabase I have an "news" entity with a NSDate attribute. 在我的coredatabase中,我有一个带有NSDate属性的“news”实体。 My app is worldwide.
我的应用是全世界的。
News was published 2015-09-04 22:15:54 +0000 French hour (GMT +2) 新闻发布2015-09-04 22:15:54 +0000法国小时(GMT +2)
To save the date, I convert it, in UTC format. 为了保存日期,我将其转换为UTC格式。
let mydateFormatter = NSDateFormatter()
mydateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss+00:00"
mydateFormatter.timeZone = NSTimeZone(abbreviation: "UTC")
var dateToSaved : NSDate! = mydateFormatter.dateFromString(date)
The news is recorded with the date : 2015-09-04 20:15:54 +0000 (UTC) 新闻记录日期: 2015-09-04 20:15:54 +0000 (UTC)
Later in the app, I need to convert this NSDate saved in String: 稍后在应用程序中,我需要将此NSDate转换为保存在String中:
let mydateFormatter = NSDateFormatter()
mydateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss+00:00"
var dateInString:String = mydateFormatter.stringFromDate(date)
Everything works perfectly if I launch the app in the same timezone when I published the news ie GMT+2. 如果我在发布新闻即GMT + 2时在同一时区启动应用程序,一切都会完美运行。
If I change the timezone of my device, for example UTC-4, then convert my NSDate in String, the date is not the same. 如果我更改设备的时区,例如UTC-4,然后在String中转换我的NSDate,则日期不一样。 I got : 2015-09-04 16:15:54 +0000
我得到了: 2015-09-04 16:15:54 +0000
How to obtain the same UTC date as in my database for any timezone? 如何在任何时区获取与我的数据库相同的UTC日期?
I'm not very comfortable with timezone, but I think my issue comes from the "+0000" in the NSDate. 我对时区不太满意,但我认为我的问题来自NSDate中的“+0000”。 In all my dates, there is always +0000, it should be the right timezone, I think.
在我的所有日期,总有+0000,我认为它应该是正确的时区。 But I don't know how to do.
但我不知道该怎么做。
Xcode 8 beta • Swift 3.0 Xcode 8 beta•Swift 3.0
Your ISO8601 date format is basic hms without Z. You need to use "xxxx" for "+0000". 您的ISO8601日期格式是没有Z的基本hms。您需要使用“xxxx”表示“+0000”。
"+0000" means UTC time.
“+0000”表示UTC时间。
let dateString = "2015-09-04 22:15:54 +0000"
let dateFormatter = DateFormatter()
dateFormatter.calendar = Calendar(calendarIdentifier: .ISO8601)
dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss xxxx"
dateFormatter.locale = Locale(localeIdentifier: "en_US_POSIX")
if let dateToBeSaved = dateFormatter.date(from: dateString) {
print(dateToBeSaved) // "2015-09-04 22:15:54 +0000"
}
If you need some reference to create your date format you can use this: 如果您需要一些参考来创建日期格式,您可以使用:
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