Question

我有一个日期格式为2 January 2020的字符串，我想将其转换为2nd Jan, 2020。

我尝试使用以下代码，但没有用：

static func formatDateFromDateTimeString(dateString: String, inputFormat: String = "yyyy-MM-dd'T'HH:mm:ss", outPutFormat:String = "dd MMM yyyy | hh:mm a" )->String {
    let inputDateFormatter = DateFormatter()
    inputDateFormatter.dateFormat = inputFormat
    let date = inputDateFormatter.date(from: dateString)
    let outputDateFormatter = DateFormatter()
    outputDateFormatter.dateFormat = outPutFormat
    if let safeDate = date {
        return outputDateFormatter.string(from: safeDate)
    }
    return ""
}

formatDateFromDateTimeString(dateString: "2 January 2020")

Answer 1

submenu-active .submenu { display: block; position: absolute; left: 0; top: 100%; min-width: 200px; }不支持普通日期格式DateFormatter，您必须自己进行操作

1st, 2nd

如果您想要这种特定的日期格式，则static func formatDateFromDateTimeString(dateString: String, inputFormat: String = "yyyy-MM-dd'T'HH:mm:ss") -> String? { let dateFormatter = DateFormatter() dateFormatter.locale = Locale(identifier: "en_US_POSIX") dateFormatter.dateFormat = inputFormat guard let date = dateFormatter.date(from: dateString) else { return nil } let day = Calendar.current.component(.day, from: date) dateFormatter.dateFormat = "MMM, yyyy" let numberFormatter = NumberFormatter() numberFormatter.numberStyle = .ordinal guard let dayString = numberFormatter.string(from: day as NSNumber) else { return nil } return dayString + " " + dateFormatter.string(from: date) } formatDateFromDateTimeString(dateString: "2 January 2020", inputFormat: "dd MMMM yyyy")参数毫无意义。

在Swift中从日期字符串转换日期

1 个答案: