iPhone デバイスのタイムゾーンを変換する方法: EST から現地時間?

let estTime = "2023-06-15 08:00:00" // Time in EST
let dateFormatter = DateFormatter()
dateFormatter.timeZone = TimeZone(identifier: "EST") // Set EST time zone
dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss" // Set date format
let estDate = dateFormatter.date(from: estTime) // Convert EST time to date object

if let estDate = estDate {
    let localTimeZone = TimeZone.autoupdatingCurrent // Get user's local time zone
    let localDate = estDate.addingTimeInterval(localTimeZone.secondsFromGMT()) // Convert EST date to local date
    
    dateFormatter.timeZone = localTimeZone // Set local time zone for display
    dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss z" // Set date format with time zone
    let localTime = dateFormatter.string(from: localDate) // Convert local date to string in local time zone
    
    print("Original EST Time:", estTime)
    print("Converted Local Time:", localTime)
}