在两个日期中获得差异- Swift

import Foundation

func getDifferenceBetweenDates(startDate: Date, endDate: Date) -> DateComponents {
    let calendar = Calendar.current
    let components = calendar.dateComponents([.year, .month, .day, .hour, .minute, .second], from: startDate, to: endDate)
    return components
}

let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd"
let startDate = dateFormatter.date(from: "2022-01-01")!
let endDate = Date()

let difference = getDifferenceBetweenDates(startDate: startDate, endDate: endDate)

print("相差 \(difference.year ?? 0) 年, \(difference.month ?? 0) 月, \(difference.day ?? 0) 天, \(difference.hour ?? 0) 小时, \(difference.minute ?? 0) 分钟, \(difference.second ?? 0) 秒")