CODEWITHSUNDEEP
iosswiftnsdateformatter
Mount Ain
Mount Ain

Reputation: 406

Swift datefomatter returns wrong time

I am working in iOS app with Dateformatter which is return wrong time. I don't have any idea to fix this. Can anyone please correct me to get correct time?

let dateString = "2020-08-11T05:32:33.000Z"

func approach1(){
    
    let dateFormatter = DateFormatter()
    dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSSXXXXX"
          
    guard let date = dateFormatter.date(from: dateString) else {fatalError()}
    
    printTime(date: date)
}

func approach2(){
    
    let dateFormatter = ISO8601DateFormatter()
    dateFormatter.formatOptions = [.withInternetDateTime, .withFractionalSeconds]
    guard let date = dateFormatter.date(from: dateString) else { fatalError()}
      
    printTime(date: date)
}

func printTime(date: Date){
    
    let dateFormatter = DateFormatter()
    dateFormatter.dateFormat = "h:mm a"
    dateFormatter.amSymbol = "AM"
    dateFormatter.pmSymbol = "PM"
    let time  = dateFormatter.string(from: date)

    print("date: \(date)")
    print("Time: \(time)") // Here it's always wrong time with those approach.
}

Current Result:

enter image description here

Upvotes: 0

Views: 554

Answers (3)

Ptit Xav
Ptit Xav

Reputation: 3219

By default dateFormatter works with local time zone. To have correct display set its time zone to UTC : dateFormatter.timeZone = TimeZone(abbreviation: "UTC")

Upvotes: 2

vadian
vadian

Reputation: 285082

There's nothing wrong. The date formatter returns the correct time

The date string

"2020-08-11T05:32:33.000Z"

represents a date in UTC(+0000).

Your local time zone is obviously UTC+0530. DateFormatter considers the local time zone by default.

To format the time also in UTC you have to set the time zone of the date formatter explicitly

func printTime(date: Date) {
    
    let dateFormatter = DateFormatter()
    dateFormatter.timeZone = TimeZone(identifier: "UTC")
    dateFormatter.dateFormat = "h:mm a"
    dateFormatter.amSymbol = "AM"
    dateFormatter.pmSymbol = "PM"
    let time  = dateFormatter.string(from: date)

    print("date: \(date)")
    print("Time: \(time)")
}

Upvotes: 1

pawello2222
pawello2222

Reputation: 54516

You need to specify the time zone when formatting to string (by default it's using your current local time zone):

func printTime(date: Date) {
    let dateFormatter = DateFormatter()
    dateFormatter.timeZone = TimeZone(abbreviation: "UTC") // <- add here
    dateFormatter.dateFormat = "h:mm a"
    dateFormatter.amSymbol = "AM"
    dateFormatter.pmSymbol = "PM"
    let time = dateFormatter.string(from: date)

    print("date: \(date)")
    print("Time: \(time)")
}

Upvotes: 1

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