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I'm trying to convert a date-time string to a date, with a DateFormatter with the TimeZone set to UTC.

The input string is in the format yyyy-MM-dd'T'HH:mm:ss'Z'.

For some reason, the subsequent Date produced is in UTC - 1:00:00. For example a date-time string of "2023-04-28T12:18:15Z" is producing a Date of 2023-04-28 11:18:15 UTC.

    let inputLogDateFormatter: DateFormatter = DateFormatter()
    private init() {
        self.inputLogDateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss'Z'"
        self.inputDateFormatter.timeZone = TimeZone(abbreviation: "UTC")
        self.inputDateFormatter.locale = Locale(identifier: "en_US_POSIX")
    }
......
let logDateTime: String = // LogString in 'inputLogDate' format.
let date: Date = self.inputLogDateFormatter.date(from: logDateTime) ?? Date(timeIntervalSince1970: 0) // Produces a time - 1 hour from input time string.
Improve this question
6
  • Check your init, you are configuring some other date formatter object in the last two lines. Commented Apr 28, 2023 at 15:00
  • The Z in the string represents the timezone. Don't ignore it. Do not quote the Z in the format and then there is no need to set a timezone on the formatter. Commented Apr 28, 2023 at 16:16
  • @JoakimDanielson Yes, you're completely right. Definitely a facepalm moment! Thank you! Commented Apr 28, 2023 at 16:59
  • 1
    What is the reason not to use ISO8601DateFormatter? Commented Apr 28, 2023 at 17:09
  • @vadian The input string isn't in the format yyyy-MM-dd HH:mm:ss.SSS? Commented Apr 29, 2023 at 22:47
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