Swift 3 timezone issue

Question

It seems setDefaultTimeZone method is no longer available in NSTimeZone. Does someone know a substitute for this?

In my AppDelegate.swift, I have:

NSTimeZone.default = TimeZone(abbreviation: "BST")!

and it works as intended I guess because in all the other files, I get NSTimeZone set to this value

Now, In my Utils, I have this method:

static func getDate(_ dateStr: String) -> Date {
    let dateFormatter = DateFormatter()
    dateFormatter.dateFormat = "yyyy-MM-dd"
    // dateFormatter.timeZone = TimeZone(abbreviation: "GMT")
    let date =  dateFormatter.date(from: dateStr)!
    return date
}

So, lets say, I give it input 2016-10-07, it gives me back 2016-10-06 23:00. Why? It gets fixed if you uncomment the line in the above code. I don't want to use this line everywhere.

For example, in some other part of my project, I have used CVCalendar. It provides a function for getting convertedDate like so

func didSelectDayView(_ dayView: DayView, animationDidFinish: Bool) {
    selectedDay = dayView
    selectedDate = dayView.date.convertedDate()!
}

The same thing as before is happening here too...that is I click on 2016-10-08 and it selectedDate here becomes 2016-10-07 23:00.

And the NSTimeZone.Default prints Europe/London everywhere.

Does anyone have any idea why is this happening?

Answer 1

Try like this.

TimeZone.ReferenceType.default = TimeZone(abbreviation: "BST")!

Edit: I have used this TimeZone with DateFormatter and get the correct BST time with date.

TimeZone.ReferenceType.default = TimeZone(abbreviation: "BST")!
let formatter = DateFormatter()
formatter.timeZone = TimeZone.ReferenceType.default
formatter.dateFormat = "yyyy-MM-dd HH:mm"
let strDate = formatter.string(from: Date())
print(strDate)

If you want to set defaultTimeZone for NSTimeZone object then in Swift 3 you can set like this.

NSTimeZone.default = TimeZone(abbreviation: "BST")!

Answer 2

let locale = NSTimeZone.init(abbreviation: "BST")
NSTimeZone.default = locale as! TimeZone

Try this

Answer 3

If you are using calendar then,

// * create calendar object *

var calendar = NSCalendar.current

// * define calendar components to use as well Timezone to UTC *

let unitFlags = Set<Calendar.Component>([.hour, .year, .minute])
calendar.timeZone = TimeZone(identifier: "UTC")!

/// Returns a time zone initialized with a given identifier.
///
/// An example identifier is "America/Los_Angeles".
///
/// If `identifier` is an unknown identifier, then returns `nil`.
public init?(identifier: String)

The geopolitical region identifier that identifies the time zone.

public var identifier: String { get }

Note : If you want to set the date formatter timezone, you can follow the above approach like this :

dateFormatter.timeZone = TimeZone(identifier: "UTC")!