将字符串转换为特定日期格式，在 iOS 中得到 nil

Question

我正在从服务器获取字符串格式的日期。所以我正在尝试格式化为特定格式。

但它正在变得零。

"07September16 4:09 am", This I want to format like Sep 07 2016

我正在使用以下代码

dateLabel.text = model().formatStringToDate(dateString: date)
    
func formatStringToDate(dateString: String) -> String {
    let dateStr = dateString
    let dateFormatter = DateFormatter()
    dateFormatter.dateFormat = "MMM d yyyy"
    let formattedDate = dateFormatter.date(from: dateStr)
    print("formattedDate \(formattedDate)")
    //I have to return formatted string here
}

有什么建议吗？

Answer 1

应该可行；

// create `Date` from date string
let dateStr = "07September16 4:09 am"
let dateFormatterGet = DateFormatter()
dateFormatterGet.locale = Locale(identifier: "en_US_POSIX") 
dateFormatterGet.dateFormat = "ddMMMMyy h:mm a"
let date = dateFormatterGet.date(from: dateStr)

// convert back Date to string as Sep 07 2016
let dateFormatterPrint = DateFormatter()
dateFormatterPrint.dateFormat = "MMM dd yyyy"
print(dateFormatterPrint.string(from: date!))

Answer 2

let dateString = "07September16 4:09 am"
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "ddMMMyy h:mm a"
let dateObj = dateFormatter.date(from: dateString)
dateFormatter.dateFormat = "MMM dd yyyy"
print("Dateobj: \(dateFormatter.string(from: dateObj!))")

Answer 3

首先，您必须从字符串中获取当前格式的日期，如`

let dateStr = dateString
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "ddMMMMyy h:mm a"
let formattedDate = dateFormatter.date(from: dateStr)!
print("formattedDate \(formattedDate)")

获取日期后，您可以获取所需格式的日期字符串，只需更改格式即可`

dateFormatter.dateFormat = "MMM dd YYYY"
let convertedDateString = dateFormatter.string(from: formattedDate)

将字符串转换为特定日期格式，在 iOS 中得到 nil

Convert string to particular date format getting nil in iOS

macos

xcode

nsdateformatter

ios

swift