Swift DateFormatter - Parse from UTC String

Question

I'm using a String extension to parse utc string to Date. But the parsed date is wrong. Not sure what i'm missing.

extension String {
var parseUTCDateTime:Date? {
    let parser = DateFormatter()
    parser.dateFormat = "MM/dd/yyyy HH:mm:ss a"
    if let result = parser.date(from: self) {
       return result
    }
    return nil
}

When I do "3/7/2022 7:40:17 AM".parseUTCDateTime, the result returned 2022-03-06 19:10:17 UTC.

Ideally the result should be 2022-03-06 07:10:17 UTC as the string contains AM in it.

Set the time zone property of your formatter to UTC if that is what the input time is, by default it is using the current time zone of the device. — Joakim Danielson
– Joakim Danielson, Commented Mar 7, 2022 at 11:23

score 2 · Accepted Answer · 2022-03-07 14:53:34Z

2

Format strings have type-safe interpolation now, so you don't need to worry about the hh vs HH anymore that tripped you up.

try Date(utc: "3/7/2022 7:40:17 AM")

extension Date {
  init(utc string: ParseStrategy.ParseInput) throws {
    try self.init(
      string,
      strategy: ParseStrategy(
        format: """
          \(month: .defaultDigits)\
          /\(day: .defaultDigits)\
          /\(year: .defaultDigits)

          \(hour: .defaultDigits(clock: .twelveHour, hourCycle: .oneBased))\
          :\(minute: .defaultDigits)\
          :\(second: .defaultDigits)

          \(dayPeriod: .standard(.narrow))
          """,
        timeZone: .init(abbreviation: "UTC")!,
        isLenient: false
      )
    )
  }
}

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