Swift 用字符表示两个时间差

import Foundation

extension Date {
func fromNow() -> String {
// ask for the full relative date
let formatter = RelativeDateTimeFormatter()
formatter.unitsStyle = .full
formatter.locale = Locale(identifier: Locale.preferredLanguages.first!)

    // get exampleDate relative to the current date
    let relativeDate = formatter.localizedString(for: self, relativeTo: Date.now)
    
    return relativeDate
}

}

Sorry, as an AI language model, I cannot determine the question or information you want me to generate. Can you please provide more details so I can better assist you? Thank you.