For my iOS App I need some calculations for Dates and Time. By using the class Calendar I found out, that this class gives me some wrong values for dates in the 19th century and before. During this time, the time zones in Europe were very unstructured. For example, GMT+0:53:28. The class Calendar knows about this and shows me the correct time zone. But the return value of "secondsFromGMT" is wrong: 3600 seconds in this case. Does anyone have some experience with this error or with related problems?
import Foundation
let timeZone = TimeZone(identifier: "Europe/Berlin")
var calendar = Calendar.current
calendar.timeZone = timeZone!
let formatter = DateFormatter()
formatter.dateFormat = "dd.MM.yyyy HH:mm:ss"
formatter.locale = Locale(identifier: "en-US")
let date = formatter.date(from: "01.07.1622 08:10:00")!
formatter.dateStyle = .long
formatter.timeStyle = .long
let stringDate = formatter.string(from: date)
let offsetFromGMT = calendar.timeZone.secondsFromGMT(for: date)
print(stringDate, " Offset =", offsetFromGMT)
July 1, 1622 at 8:10:00 AM GMT+0:53:28 Offset = 3600
Related
This question already has answers here:
How can I parse / create a date time stamp formatted with fractional seconds UTC timezone (ISO 8601, RFC 3339) in Swift?
(13 answers)
Closed 3 years ago.
I am converting current date into GMT/UTC date string. But every time it returns me with wrong date.
My todays date is 07 February 2020, 11:09:20 AM. You can refer below image.
Here is my code :
let apiFormatter = DateFormatter()
//apiFormatter.dateStyle = DateFormatter.Style.long
//apiFormatter.timeStyle = DateFormatter.Style.long
//apiFormatter.calendar = Calendar.current
apiFormatter.timeZone = TimeZone.init(identifier: "GMT") //TimeZone(abbreviation: "UTC") //TimeZone.current //
//apiFormatter.locale = Locale.current
//apiFormatter.dateFormat = "yyyy-MM-DD HH:mm:ss"
apiFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'"
//apiFormatter.dateFormat = "yyyy-MM-dd'T'hh:mm:ssZ"
let endDate = apiFormatter.string(from: Date())
print(endDate)
And what I am getting in return is also you can check in image - 2020-02-38T05:33:34.598Z. I have tried with all the format, but no any luck. Can anyone suggest where it is going wrong?
First of all, the format should be:
apiFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSSZ"
The Z is not a literal letter, it's the description of the time zone. However, making it a literal won't probably make a problem.
The 38 for day from your output is obviously caused by the DD format you have commented out.
Nevertheless, you have to set the locale:
apiFormatter.locale = Locale(identifier: "en_US_POSIX")
Otherwise you will have problems with 12/24h switching.
let apiFormatter = DateFormatter()
apiFormatter.locale = Locale(identifier: "en_US_POSIX")
// remove this if you want to keep your current timezone (shouldn't really matter, the time is the same)
apiFormatter.timeZone = TimeZone(secondsFromGMT: 0)
apiFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSSZ"
let endDate = apiFormatter.string(from: Date())
print(endDate) // 2020-02-07T08:25:23.470+0000
print(Date()) // 2020-02-07 08:25:23 +0000
Also note that you can use ISO8601DateFormatter instead of DateFormatter.
Try this and adjust according to what format you are getting from server -
private func getFormatedDateInString(_ dateString: String) -> String? {
let dateFormatter = DateFormatter()
dateFormatter.locale = Locale(identifier: "en_US_POSIX")
dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSSZ"
dateFormatter.timeZone = TimeZone(identifier: "UTC")
if let date = dateFormatter.date(from: dateString) {
dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSSZ"
dateFormatter.timeZone = TimeZone.current
let timeStamp = dateFormatter.string(from: date)
return timeStamp
}
return nil
}
i am trying to change the weeks day symbols in swift
with the code below
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "EEEE d MMM"
dateFormatter.weekdaySymbols = ["Måndag", "Tisdag", "Onsdag", "Torsdag", "Fredag", "Lördag", "Söndag"]
let dateString = dateFormatter.string(from: Date())
print(dateString)
And i am getting this wrong day blow
Tisdag 9 Jul
but today is Monday
Instead of managing weekday names yourself, you could use DateFormatter's template api.
let dateFormatter = DateFormatter()
dateFormatter.setLocalizedDateFormatFromTemplate("dEEEEMMM")
let dateString = dateFormatter.string(from: Date()).capitalized(with: locale)
print(dateString)
This should use the phone's locale, which should be what user wants most times.
But you can also set the locale manually.
If you add
let locale = Locale(identifier: "sv_SE")
dateFormatter.locale = locale
it will print
Måndag 9 Juli
if you use
let locale = Locale(identifier: "de_DE")
it prints
Montag, 9. Juli
weekdaySymbols start with sunday, not with monday. You need to change this:
dateFormatter.weekdaySymbols = ["Söndag", "Måndag", "Tisdag", "Onsdag", "Torsdag", "Fredag", "Lördag"]
I have checked other questions but none of them helped me much.
I have following string:
let dateString = "2018-04-29T21:00:00.000Z"
I have successfully converted it to date using the following:
let dateFormatter = DateFormatter()
dateFormatter.locale = Locale(identifier: "en_US_POSIX")
dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSSZ"
let convertedDate = dateFormatter.date(from: dateString)
But now I only want the time "hh:mm a" using timezone such as "+8". I have tried following way but it's not working:
let dateFormatter = DateFormatter()
dateFormatter.timeZone = TimeZone(abbreviation: "UTC+8")
dateFormatter.dateFormat = "hh:mm a"
let requiredTime = dateFormatter.string(from: convertedDate!)
Can anyone help me to overcome this problem?
The format you want is hh:mm a Z, which will provide the +0800.
You want to create a TimeZone which +8 hours from GMT, normally I prefer to use the appropriate abrivations (ie AET), but I guess if you don't have that, you can create a TimeZone using secondsFromGMT, for example...
let tz = TimeZone(secondsFromGMT: 8 * 60 * 60)
let toFormatter = DateFormatter()
toFormatter.timeZone = tz
toFormatter.dateFormat = "hh:mm a Z"
let requiredTime = toFormatter.string(from: convertedDate!)
Which based on your example data, will produce a value of...
05:00 AM +0800
I have displayed the list of timezones in my app. If user selects a particular timezones, I need to change the local timezone to the selected timezone by the user.
let region = Region(tz: timeZoneName.timeZone , cal: cal, loc: cal.locale!)
let date = Date().inRegion(region: region).absoluteDate
Here is the problem, the region is changed to the selected timezone but the date issuing the local timezone.
A Date contains no timezone. From apple's docs: A specific point in time, independent of any calendar or time zone.
The timezone comes into play as soon as you want to present a date to the user. And that's what a DateFormatter is for. As #AlexWoe89 already pointed out, it let's you convert a string, containing a date into a Date object, but also lets you convert a given date into a string representing the date in the time zone you set to the timeZone property of DateFormatter.
let date = Date()
var dateFormatter = DateFormatter()
dateFormatter.locale = Locale(identifier: "en_US_POSIX")
dateFormatter.dateFormat = "yyyy-MM-dd HH:mm"
dateFormatter.timeZone = TimeZone(identifier: "America/Los_Angeles")
let dateString1 = dateFormatter.string(from: date)
dateFormatter.timeZone = TimeZone(identifier: "Germany/Berlin")
let dateString2 = dateFormatter.string(from: date)
This will store 2017-10-23 04:27 in dateString1, while the same date leads to 2017-10-23 13:27 in dateString2.
You can use DateFormatter as a solution, try something like this:
let dateString = "<yourDateAsString>"
let dateFormatter = DateFormatter()
dateFormatter.locale = Locale(identifier: "en_US_POSIX") // => there are a lot of identifiers you can use
dateFormatter.timeZone = TimeZone(secondsFromGMT: 0)
dateFormatter.defaultDate = Date()
dateFormatter.dateFormat = "dd-MM-yyyy hh:mm” // => your needed time format
let convertedDate = dateFormatter.date(from: dateString)
I have a date "2014-07-02 20:57:38 +0000" and I want to format it as "Today at 8:57 pm".
I want that if a string is yesterday, then display it as "Yesterday at 9:00 am". If it is neither today or yesterday, just show the actually date like "27/6 at 7:53 pm".
I was able to get the time with format like "8:57 AM" with the code below.
var formatter : NSDateFormatter = NSDateFormatter()
formatter.dateFormat = "h:mm a"
// message.createdAt is the date
let dateString = formatter.stringFromDate(message.createdAt)
println(dateString)
//output = 8:57 AM
However, when I use the following code, it returns a blank string.
var formatter : NSDateFormatter = NSDateFormatter()
formatter.dateFormat = "h:mm a"
formatter.doesRelativeDateFormatting = true //<-- This doesn't work
let dateString = formatter.stringFromDate(message.createdAt)
println(dateString)
//output = (nothing, its a blank string)
How do I make this work and display "Today" or "Yesterday" in Swift?
The reason it's blank is that your date format only has time components. Combined with .doesRelativeDateFormatting that gives you the empty string. If you want that custom time format, I think you need separate formatters for the date and the time:
let now = NSDate()
let dateFormatter = NSDateFormatter()
dateFormatter.dateStyle = .MediumStyle
dateFormatter.doesRelativeDateFormatting = true
let timeFormatter = NSDateFormatter()
timeFormatter.dateFormat = "h:mm a"
let time = "\(dateFormatter.stringFromDate(now)), \(timeFormatter.stringFromDate(now))"
println(time) // prints "Today, 5:10 PM"
With Swift 5.1, Apple Developer API Reference states about DateFormatter's dateFormat property:
You should only set this property when working with fixed format representations, as discussed in Working With Fixed Format Date Representations. For user-visible representations, you should use the dateStyle and timeStyle properties, or the setLocalizedDateFormatFromTemplate(_:) method if your desired format cannot be achieved using the predefined styles; both of these properties and this method provide a localized date representation appropriate for display to the user.
The following Playground sample code shows how to display your dates in the desired format using dateStyle, timeStyle and doesRelativeDateFormatting properties:
import Foundation
let now = Date() // 2019-08-09 12:25:12 +0000
let yesterday = Calendar.current.date(byAdding: .day, value: -1, to: now)! // 2019-08-08 12:25:12 +0000
let aWeekAgo = Calendar.current.date(byAdding: .weekOfMonth, value: -1, to: now)! // 2019-08-02 12:25:12 +0000
let dateFormatter = DateFormatter()
dateFormatter.dateStyle = .long
dateFormatter.timeStyle = .short
dateFormatter.doesRelativeDateFormatting = true
let nowString = dateFormatter.string(from: now)
print(nowString) // prints: Today at 2:25 PM
let yesterdayString = dateFormatter.string(from: yesterday)
print(yesterdayString) // prints: Yesterday at 2:25 PM
let aWeekAgoString = dateFormatter.string(from: aWeekAgo)
print(aWeekAgoString) // prints: August 2, 2019 at 2:25 PM
Give this a try in Swift:
let dateFormatter = DateFormatter()
dateFormatter.dateStyle = .short
dateFormatter.timeStyle = .short
dateFormatter.doesRelativeDateFormatting = true
let date = Date()
let dateString = dateFormatter.string(from:date)