convert gmt to australian eastern daylight time in swift

To convert a GMT time to Australian Eastern Daylight Time in Swift, you will need to make use of the DateFormatter and TimeZone classes. Here's an example code snippet:

main.swift
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss"
dateFormatter.timeZone = TimeZone(abbreviation: "GMT")

// Get the current date and time in GMT.
let gmtDate = Date()
let gmtDateString = dateFormatter.string(from: gmtDate)

// Convert GMT to Australian Eastern Daylight Time.
dateFormatter.timeZone = TimeZone(abbreviation: "AEDT")
if let aedtDate = dateFormatter.date(from: gmtDateString) {
    let aedtDateString = dateFormatter.string(from: aedtDate)
    print("Converted GMT to AEDT: \(aedtDateString)")
} else {
    print("Failed to convert GMT to AEDT.")
}
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In this example, we first create a DateFormatter instance and set its format to "yyyy-MM-dd HH:mm:ss" - this is the format of the date and time string we'll be working with. We also set the time zone to "GMT".

Next, we get the current date and time in GMT using the Date class and format it as a string using our dateFormatter.

Finally, we convert the GMT time to Australian Eastern Daylight Time by setting the time zone on our dateFormatter instance to "AEDT" and calling dateFormatter.date(from:). If the conversion succeeds, we format the resulting Date object as a string and print it out.

Note that the time zones used in this example are just examples - you will need to use the appropriate time zone abbreviations for your specific situation.