快速结伴之后日期无法正确显示

问题描述

我已经按照代码分隔了日期和时间，然后我使用了DateFormatter，但日期未正确输入。为什么？

像这样来：可选（“ 08/15/0020”）

  var formateFromdate: String?
  var formatetodate: String?

  func addDate(){

  var fromDateArr = fromDateLabel.text!.components(separatedBy: ",")
        fromDate = fromDateArr[0]
        fromTime = fromDateArr[1].replacingOccurrences(of: " ",with: "")
  var toDateArr   = toDateLabel.text!.components(separatedBy: ",")
        toDate = toDateArr[0]
        toTime  = toDateArr[1].replacingOccurrences(of: " ",with: "")
        
        let inputFormatter = DateFormatter()
        inputFormatter.dateFormat = "MM/dd/yyyy"
                 
        let showDateFrom = inputFormatter.date(from: fromDate)
        inputFormatter.dateFormat = "MM/dd/yyyy"
        formateFromdate = inputFormatter.string(from: showDateFrom!)
        print(formateFromdate)
        }

注意：此处fromDate = 08/15/2020正确，但是在补习日期之后不正确

输出：

    Optional("08/15/0020") it should be 08/15/2020


 

解决方法

您需要先将其打开

if let formate = inputFormatter.string(from: showDateFrom!){
        print(formate)
}

,

从格式化的日期输出中，看来fromDate = fromDateArr[0]的值为"08/15/20"。在这种情况下，您将必须使用以下日期格式；

    let inputFormatter = DateFormatter()
    inputFormatter.dateFormat = "MM/dd/yy"
    
    let showDateFrom = inputFormatter.date(from: fromDate)
    inputFormatter.dateFormat = "MM/dd/yyyy"
    let formateFromdate = inputFormatter.string(from: showDateFrom!)
    print(formateFromdate)