Convert Etc/GMT time into Swift Date() global TIme

Question

I am trying to convert date from apple receipt to swift global date and time. But I am not succeeded,

Purchased time (device): 2019-08-30 22:23:44 America/Los_Angeles

Purchased time (server): 2019-08-31 05:23:44 Etc/GMT

Expire time (server): 2019-08-31 05:28:44 Etc/GMT

When I get date by using Date(), it's completely or almost some hour difference than my device & those date&time above. I wanted to compare today Date() into expire time.

I used below codes but not success,

extension Date {
    static func fromAppleServer(dateString: String) -> Date? {
        let seperated = dateString.components(separatedBy: " ")
        let dateFormatter = DateFormatter()
        dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss"
        dateFormatter.timeZone = TimeZone(identifier: seperated.last!)
        let dateObject = dateFormatter.date(from: (seperated.dropLast()).joined(separator: " "))
        return dateObject
    }
    static func localUTC() -> Date {
        let date = Date()
        print("Date before conversion: \(date)")
        let dateFormatter = DateFormatter()
        dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss"
        let string = dateFormatter.string(from: date)
        dateFormatter.timeZone = TimeZone(identifier: "America/Los_Angeles")
        return dateFormatter.date(from: string)!
    }
}

---

let appleDate = Date.fromAppleServer(dateString: "2019-08-30 22:29:02 America/Los_Angeles") //used  2019-08-31 05:23:44 Etc/GMT too
let localUTC = Date.localUTC()

print("Apple Server: ",appleDate) //Always 2019-08-31 05:29:02 +0000
print("Local UTC: ",localUTC)

Update:

Tried code:

extension Date{

    static func fromAppleServer(dateString: String) -> Date?{

        let dateFormatter = DateFormatter()
        dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss VV"
        dateFormatter.timeZone = TimeZone(identifier: "UTC")
        let dateObject = dateFormatter.date(from: dateString)
        return dateObject
    }

    static func localUTC() -> Date{

        let date = Date()
        let dateFormatter = DateFormatter()
        dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss VV"
        let string = dateFormatter.string(from: date)
        dateFormatter.timeZone = TimeZone(identifier: "UTC")
        return dateFormatter.date(from: string)!
    }
}

Debugging Log:

(lldb) po print date
    ▿ 2019-08-31 05:28:44 +0000
- timeIntervalSinceReferenceDate : 588922124.0

Fix-it applied, fixed expression was:
print; date
(lldb) po print Date.localUTC()
▿ 2019-09-01 03:07:45 +0000
- timeIntervalSinceReferenceDate : 589000065.0

Fix-it applied, fixed expression was:
print; Date.localUTC()
(lldb) po print self.expiryDate
▿ Optional<String>
- some : "2019-08-31 05:28:44 Etc/GMT"

Fix-it applied, fixed expression was:
print; self.expiryDate
(lldb) po print Date()
▿ 2019-09-01 03:09:03 +0000
- timeIntervalSinceReferenceDate : 589000143.939402

Fix-it applied, fixed expression was:
print; Date()
(lldb)

Here,

Device date is ~ 8:mm PM, Sat 31 August. Purchased date is(5 mins duration):2019-08-31 05:23:44 Etc/GMT (For device it's 8:mm PM Sat 31 August) Expire date is: 2019-08-31 05:28:44 Etc/GMT Swift Date is:~ 2019-09-01 03:09:03

I thought we can easily compare date once Etc/GMT time is converted into Swift Date() global time. But I can't convert 2019-08-31 05:28:44 Etc/GMT to ~ 2019-09-01 03:09:03. So, how to convert it? or Any other suggestions welcome.

Note: '~' indicates some seconds or minutes delay because of testing time.

Answer 1

No need to manually parse your date string. You can use date format "VV" to interprete the timezone identifier associated with your date string:

extension Formatter {
    static let customDate: DateFormatter = {
        let formatter = DateFormatter()
        formatter.locale = Locale(identifier: "en_US_POSIX")
        formatter.dateFormat = "yyyy-MM-dd HH:mm:ss VV"
        return formatter
    }()
}

---

let dateString = "2019-08-31 05:23:44 Etc/GMT" // or "2019-08-30 22:23:44 America/Los_Angeles"
if let date = Formatter.customDate.date(from: dateString) {
    print(date)  // "2019-08-31 05:23:44 +0000\n"
    print(date.description(with: .current))  // "Saturday, August 31, 2019 at 2:28:44 AM Brasilia Standard Time\n"
}