ios 如何快速将日期格式从 dd/MM/YYYY 转换为 YYYY-MM-dd
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How to convert date format from dd/MM/YYYY to YYYY-MM-dd in swift
提问by iParesh
I tired to covert from 21/07/2016to 2016-07-21but got this date 2015-12-20
Here is the Code that i have try
我厌倦了从21/07/2016到 2 016-07-21但得到了这个日期2015-12-20
这是我尝试过的代码
let inputFormatter = NSDateFormatter()
inputFormatter.dateFormat = "MM/dd/YYYY"
let outputFormatter = NSDateFormatter()
outputFormatter.dateFormat = "YYYY-MM-dd"
let showDate = inputFormatter.dateFromString("07/21/2016")
let resultString = outputFormatter.stringFromDate(showDate!)
print(resultString)
How to convert?
Thank you
如何转换？
谢谢
回答by Nirav D
First changes your yearformatter with yyyyand instead of using two NSDateFormatteruse just one like this
首先改变你的year格式化程序yyyy而不是使用两个NSDateFormatter像这样使用一个
let inputFormatter = NSDateFormatter()
inputFormatter.dateFormat = "MM/dd/yyyy"
let showDate = inputFormatter.dateFromString("07/21/2016")
inputFormatter.dateFormat = "yyyy-MM-dd"
let resultString = inputFormatter.stringFromDate(showDate!)
print(resultString)
For swift3
对于 swift3
func convertDateFormater(_ date: String) -> String
{
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss z"
let date = dateFormatter.date(from: date)
dateFormatter.dateFormat = "yyyy-MM-dd"
return dateFormatter.string(from: date!)
}
回答by ahmedomer
You can define a function like the one below:
你可以定义一个像下面这样的函数：
// input string should always be in format "21/07/2016" ("dd/MM/yyyy")
func formattedDateFromString(dateString: String, withFormat format: String) -> String? {
let inputFormatter = NSDateFormatter()
inputFormatter.dateFormat = "dd/MM/yyyy"
if let date = inputFormatter.dateFromString(dateString) {
let outputFormatter = NSDateFormatter()
outputFormatter.dateFormat = format
return outputFormatter.stringFromDate(date)
}
return nil
}
You can use the above to pass an output format for your date string. Input format will always be dd/MM/yyyy. Then you use it as follows:
您可以使用上述内容为日期字符串传递输出格式。输入格式将始终为 dd/MM/yyyy。然后按如下方式使用它：
let stringA = formattedDateFromString("21/07/2016", withFormat: "yyyy-MM-dd")
let stringB = formattedDateFromString("21/07/2016", withFormat: "MMM dd, yyyy")
NSLog("stringA: \(stringA)") // 2016-07-21
NSLog("stringB: \(stringB)") // Jul 21, 2016
