Swift获取日期比今天早了五年

import Foundation

// 获取当前日期
let today = Date()

// 创建一个Calendar实例
let calendar = Calendar.current

// 创建一个DateComponents实例，表示要减去的时间间隔
var dateComponents = DateComponents()
dateComponents.year = -5

// 使用Calendar的date(byAdding:to:wrappingComponents:)方法计算新的日期
if let fiveYearsAgo = calendar.date(byAdding: dateComponents, to: today) {
    // 格式化日期为字符串
    let dateFormatter = DateFormatter()
    dateFormatter.dateFormat = "yyyy-MM-dd"
    let fiveYearsAgoString = dateFormatter.string(from: fiveYearsAgo)
    
    print("五年前的日期是：\(fiveYearsAgoString)")
} else {
    print("日期计算错误")
}