How can I convert date string to time string?-CodePudding

I have a string that looks like this:

"date": "2022-06-30T02:15:00.000 07:00"

And I formatted it to convert to "HH:mm" like this:

func formatTime(string: String) -> String {
    let dateFormatterGet = DateFormatter()
    dateFormatterGet.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSSZZZZZ"

    let dateFormatterPrint = DateFormatter()
    dateFormatterPrint.dateFormat = "HH:mm"

    let date: Date? = dateFormatterGet.date(from: string)
    return dateFormatterPrint.string(from: date ?? Date())
}

The result I want it returns is 09:15, but it returns 02:15. Can someone tell me where I went wrong? Thank you

CodePudding user response：

"2022-06-30T02:15:00.000 07:00" is the date in the time zone plus 7 hours from the UTC time zone. Than this date in UTC is “ 2022-06-29T19:15:00Z”

while dateFormatterPrint has a default locale configuration according to the phone settings

You need to set UTC timezone

CodePudding user response：

In this case you might want to convert the DateTime to your local time first:

Convert To LocalTime:

func utcToLocal(dateStr: String) -> String? {
  let dateFormatter = DateFormatter()
  dateFormatter.dateFormat = "HH:mm"
  dateFormatter.timeZone = TimeZone(abbreviation: "UTC")
  if let date = dateFormatter.date(from: dateStr) {
    dateFormatter.timeZone = TimeZone.current
    dateFormatter.dateFormat = "HH:mm"

    return dateFormatter.string(from: date)
  }
  return nil
}

And then:

let utcTime = formatTime(string: "2022-06-30T02:15:00.000 07:00")
let localTime = utcToLocal(dateStr: utcTime)
print(localTime)

The Result:

09:15

I hope this help you solve your problem.