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swiftnsdateformatter

How to convert a String of certain format to Date in Swift?

I have strings like this 2020-09-21T21:13:55.636Z... I want to convert them into Dates and here's what I do;

func convertToDate(str: String) -> Date {
    let dateFormatter = DateFormatter()
    dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ssZ"

    return dateFormatter.date(from: str)!
}

The above code crashes on the unwrapping. I'm guessing it's because of the format... Any idea what I'm doing wrong?

Solution

  • For that date string you should use ISO8601DateFormatter, like this:

    var str = "2020-09-21T21:13:55.636Z"

let formatter = ISO8601DateFormatter()
formatter.formatOptions = [.withInternetDateTime, .withFractionalSeconds]
let date = formatter.date(from: str)

    That will save you the trouble of trying to get a format string exactly right.