在"st"中显示日期，"nd"，"rd"和"th"个格式 [英] Display date in "st" , "nd", "rd" and "th" format

问题描述

我必须以其他格式显示日期.

I have to display date in different format.

例如 7月21日

我没有找到任何可以转换这种格式的日期的信息.如果有人知道，请帮助我.

I didn't find anything to convert my date in this format. If anyone knows please help me.

推荐答案

Swift

extension Date {

    func dateFormatWithSuffix() -> String {
        return "dd'\(self.daySuffix())' MMMM yyyy"
    }

    func daySuffix() -> String {
        let calendar = Calendar.current
        let components = (calendar as NSCalendar).components(.day, from: self)
        let dayOfMonth = components.day
        switch dayOfMonth {
        case 1, 21, 31:
            return "st"
        case 2, 22:
            return "nd"
        case 3, 23:
            return "rd"
        default:
            return "th"
        }
    }
}

示例

let date = Date()
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = date.dateFormatWithSuffix()
print(dateFormatter.string(from: date))
// Output for current date: 22nd May 2019

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