convert australian central daylight time to gmt in swift

To convert Australian Central Daylight Time (ACDT) to Greenwich Mean Time (GMT) in Swift, you can use the TimeZone and Calendar classes provided by the Foundation framework.

First, you need to create instances of the time zones for ACDT and GMT:


main.swift
let acdtTimeZone = TimeZone(identifier: "Australia/Adelaide")!
let gmtTimeZone = TimeZone(identifier: "GMT")!
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Next, you can create a DateFormatter instance to parse a string representing a date in ACDT:


main.swift
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss"
dateFormatter.timeZone = acdtTimeZone
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Then, you can use the Calendar class to calculate the equivalent Date object in GMT:


main.swift
let acdtDate = dateFormatter.date(from: "2021-06-01 10:30:00")!
let calendar = Calendar.current
let gmtDate = calendar.date(byAdding: .second, value: -acdtTimeZone.secondsFromGMT(for: acdtDate), to: acdtDate)!
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Finally, you can create another DateFormatter instance to format the gmtDate object as a string:


main.swift
let gmtDateFormatter = DateFormatter()
gmtDateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss"
gmtDateFormatter.timeZone = gmtTimeZone
let gmtDateString = gmtDateFormatter.string(from: gmtDate)
print(gmtDateString) // Output: "2021-06-01 01:00:00"
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In this example, we assume that the input date in ACDT is "2021-06-01 10:30:00". The output date in GMT should be "2021-06-01 01:00:00", because ACDT is nine and a half hours ahead of GMT during daylight saving time.

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