Swiftyjson: Date and Time

[rmoffett]

Where is json["date"].date or json["time"].time?

[kukabi]

You may use an extension like below,

extension JSON {

    public var date: NSDate? {
        get {
            switch self.type {
            case .String:
                return Formatter.jsonDateFormatter.dateFromString(self.object as! String)
            default:
                return nil
            }
        }
    }

    public var dateTime: NSDate? {
        get {
            switch self.type {
            case .String:
                return Formatter.jsonDateTimeFormatter.dateFromString(self.object as! String)
            default:
                return nil
            }
        }
    }

}

and initialize formatters depending on the data you may receive.

class Formatter {

    private static var internalJsonDateFormatter: NSDateFormatter?
    private static var internalJsonDateTimeFormatter: NSDateFormatter?

    static var jsonDateFormatter: NSDateFormatter {
        if (internalJsonDateFormatter == nil) {
            internalJsonDateFormatter = NSDateFormatter()
            internalJsonDateFormatter!.dateFormat = "yyyy-MM-dd"
        }
        return internalJsonDateFormatter!
    }

    static var jsonDateTimeFormatter: NSDateFormatter {
        if (internalJsonDateTimeFormatter == nil) {
            internalJsonDateTimeFormatter = NSDateFormatter()
            internalJsonDateTimeFormatter!.dateFormat = "yyyy'-'MM'-'dd'T'HH':'mm':'ss.SSS'Z'"
        }
        return internalJsonDateTimeFormatter!
    }

}

[craigpearce5]

I like this answer, however I have a question. If the dateFormat I enter in the Formatter class doesn't match the json, will it not return anything?

For example, my json date is 2016-01-27T12:01:40.915-07:00 and my dateFormat is "yyyy'-'MM'-'dd'T'HH':'mm':'ss'.'SSS'-'xxx" but nothing is returned. Is that because my dateFormat is wrong, or do I have issues elsewhere?

[lmacfadyen]

My JSON format is same as yours and here is the format I used: "yyyy'-'MM'-'dd'T'HH':'mm':'ss'.'SSSZZ"

[craigpearce5]

@lmacfadyen Thanks very much, I will give that a try.

[craigpearce5]

@lmacfadyen That worked. Thanks very much.

[craigpearce5]

@rmoffett This issue should be closed.

[yesitsdave]

It would be good to add locale setting on the NSDateFormatter to this, otherwise it may fail depending on device locale.

[AlBlanc]

Thank you for this nice snippet, it saved me some time.

Here is the code updated for Swift3:

class Formatter {

    private static var internalJsonDateFormatter: DateFormatter?
    private static var internalJsonDateTimeFormatter: DateFormatter?

    static var jsonDateFormatter: DateFormatter {
        if (internalJsonDateFormatter == nil) {
            internalJsonDateFormatter = DateFormatter()
            internalJsonDateFormatter!.dateFormat = "yyyy-MM-dd"
        }
        return internalJsonDateFormatter!
    }

    static var jsonDateTimeFormatter: DateFormatter {
        if (internalJsonDateTimeFormatter == nil) {
            internalJsonDateTimeFormatter = DateFormatter()
            internalJsonDateTimeFormatter!.dateFormat = "yyyy'-'MM'-'dd'T'HH':'mm':'ss.SSS'Z'"
        }
        return internalJsonDateTimeFormatter!
    }

}

extension JSON {

    public var date: Date? {
        get {
            switch self.type {
            case .string:
                return Formatter.jsonDateFormatter.date(from: self.object as! String)
            default:
                return nil
            }
        }
    }

    public var dateTime: Date? {
        get {
            switch self.type {
            case .string:
                return Formatter.jsonDateTimeFormatter.date(from: self.object as! String)
            default:
                return nil
            }
        }
    }

}

[OrkhanAlikhanov]

Formatter class can be reduced to:

class Formatter {
    static let jsonDateFormatter: DateFormatter = {
        let formatter = DateFormatter()
        formatter.dateFormat = "yyyy-MM-dd"
        return formatter
    }()

    static let jsonDateTimeFormatter: DateFormatter = {
        let formatter = DateFormatter()
        formatter.dateFormat = "yyyy'-'MM'-'dd'T'HH':'mm':'ss.SSS'Z'"
        return formatter
    }()
}

[lukemcgregor]

In iOS 10+

    static let jsonDateTimeFormatter: DateFormatter = ISO8601DateFormatter()

[ykphuah]

Is there a reason why this is not included? Will a PR be accepted?

I am using this with Outlook, and the dateTime doesn't send the milliseconds so the regex above will fail, I need to remove the SSS part and it worked.