Ios Swift日期从TimeZone转换

import Foundation

func convertDate(from dateString: String, fromTimeZone: TimeZone, toTimeZone: TimeZone) -> String? {
    let dateFormatter = DateFormatter()
    dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss"
    dateFormatter.timeZone = fromTimeZone
    
    if let date = dateFormatter.date(from: dateString) {
        let newDateFormatter = DateFormatter()
        newDateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss"
        newDateFormatter.timeZone = toTimeZone
        
        return newDateFormatter.string(from: date)
    }
    
    return nil
}

let dateString = "2022-01-01 12:00:00"
let fromTimeZone = TimeZone(identifier: "America/New_York")!
let toTimeZone = TimeZone(identifier: "Asia/Shanghai")!

if let convertedDate = convertDate(from: dateString, fromTimeZone: fromTimeZone, toTimeZone: toTimeZone) {
    print("转换后的日期：\(convertedDate)")
} else {
    print("日期转换失败")
}