迅速格式化日期问题4

由猪坚强发布于 2020-08-11 16:38:07

我在Swift 4中格式化日期时遇到问题下面提供了格式化源代码时HH：mm：ss获得错误数据的时间。

    let dateFormatter : DateFormatter = DateFormatter()
    dateFormatter.dateFormat = "dd-MMM-yyyy HH:mm:ss a
    let date = Date()
    let dateString = dateFormatter.string(from: date)

我得到的结果是：2020年8月11日下午12:01:23

如果我正在尝试将字符串日期的结果转换为日期

    let dateFormatter = DateFormatter()
    dateFormatter.dateFormat = "dd-MMM-yyyy HH:mm:ss a" 
    let serverDate: Date = dateFormatter.date(from: dateString)!

我得到的结果是：2020-08-11 06:31:39 +0000

预期必须为：2020-08-11 12:01:23 +0000 但我得到的结果是：2020-08-11 06:31:39 +0000

如果有人知道解决方案，请给我解决方案。

rtotam

2020-08-11 16:38:08

The problem is in your format. If you try with dateFormat = "dd-MMM-yyyy HH:mm:ss", you will get the same results. Also, I recommend you to set locale and timezone. For example:

let dateFormatter : DateFormatter = DateFormatter()
dateFormatter.locale = Locale(identifier: "en_US_POSIX")
dateFormatter.timeZone = NSTimeZone.local
dateFormatter.dateFormat = "dd-MMM-yyyy HH:mm:ss"
let date = Date()
let dateString = dateFormatter.string(from: date)

let serverDate: Date = dateFormatter.date(from: dateString)!

冬莲

2020-08-11 16:38:08

HH:mm:ss gives you the time in 24 hour format, so a doesn't make sense inside the format. Or you can use hh:mm:ss a.

Date() gives you the time in UTC. You need to provide the timezone information to get the date in your timezone.

    let date = Date()
    let dateFormatter = DateFormatter()
    dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss a"
    dateFormatter.timeZone = .current
    let localDate = dateFormatter.string(from: date)
    
    print(localDate)

localDate will give you the date in your current timezone.

猪坚强

这家伙很懒，什么都没留下

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