如何从日期字符串 Swift 中隐藏时间

Question

I have the string:

1980-02-17T04:00:00.000Z

I want to remove all text after "T" in:

Text(user.DOB)

How would I do this?

Thank you

Answer 1

Option 1 (formatting a date object):

let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "YYY-MM-dd"
let monthString = dateFormatter.string(from: user.DOB)

where:

dateFormatter.dateFormat = "YYY-MM-dd"

represents the format of date you want

If you don't have a date object you can get one from your string:

  formatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSSZ"

  let parsedDate = formatter.dateFromString(date)

Option 2(formating a date string):

let parsedDate = date.prefix(10) 

Answer 2

While not particularly sophisticated, you could simply go for

Text(user.DOB.prefix(10))

It lets you keep MongoDB's format for elsewhere in your app if you end up needing it.

Answer 3

var str = "1980-02-17T04:00:00.000Z"
if let index = str.firstIndex(of: "T") {
    let a = str.substring(to: index)
    print(a) // Prints 1980-02-17
}

Considering you don't want T in the final output.

Answer 4

Or you could just:

var dateStringWithoutT = "1980-02-17T04:00:00.000Z"
                              .split(separator: "T")
                              .first

What the above code does is, split the string by "T" and you get ["1980-02-17","04:00:00.000Z"] , then, use array's first property to get what you need.

Complexity: O(n)