convert australian eastern daylight time to gmt in swift

Here's an example code snippet that converts a given Australian Eastern Daylight Time (AEDT) date to GMT using Swift:


main.swift
let dateString = "2021-10-31 09:30:00" // example AEDT date string
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss"
dateFormatter.timeZone = TimeZone(abbreviation: "AEDT")

guard let aedtDate = dateFormatter.date(from: dateString) else {
    fatalError("Invalid AEDT date string: \(dateString)")
}

let calendar = Calendar.current
let gmtTimeZone = TimeZone(abbreviation: "GMT")!
let gmtOffset = gmtTimeZone.secondsFromGMT(for: aedtDate)
let gmtDate = calendar.date(byAdding: .second, value: -gmtOffset, to: aedtDate)!

print("AEDT date: \(aedtDate), GMT date: \(gmtDate)")
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The code creates a date formatter with the AEDT timezone, and uses it to convert the input date string to a Date object. Then, it retrieves the GMT timezone and calculates the offset between the AEDT and GMT timezones for the given AEDT date. Finally, it uses the date(byAdding:to:options:) method of Calendar to subtract the GMT offset from the AEDT date and get the corresponding GMT date. The resulting GMT date can be used for further processing or display.

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