Swift - iOS - Dates and times in different format

Question

I am working for an application written in swift and i want to manipulate dates and times let timestamp   NSDateFormatter localizedStringFromDate      NSDate        dateStyle   ShortStyle      timeStyle   ShortStyle    returns 2 12 15  11 27 PM  if I want date and time in a different format  for example the date in a European format like dd mm yy and the hours in the 24h format without AM and PM  Is there some function that i can use or i have to use N Strings to reorder the various elements

User · Answer

Here is a solution that works with Xcode 10.1 (FEB 23 2019) :

func getCurrentDateTime() {

    let now = Date()
    let formatter = DateFormatter()
    formatter.locale = Locale(identifier: "fr_FR")
    formatter.dateFormat = "EEEE dd MMMM YYYY"
    labelDate.text = formatter.string(from: now)
    labelDate.font = UIFont(name: "HelveticaNeue-Bold", size: 12)
    labelDate.textColor = UIColor.lightGray

    let text = formatter.string(from: now)
    labelDate.text = text.uppercased()
}

The "Accueil" Label is not connected to the code.

User · Answer

let dateString    1970-01-01T13 30 00 000Z  let formatter   DateFormatter    formatter dateFormat    yyyy-MM-dd T HH mm ss  let date   formatter date from  String dateString dropLast 5     formatter dateFormat    hh mma  print formatter string from  date     if You notice I have set  dateFormat    hh mma by this you will get time only  Result 01 30PM

User · Answer

As Zaph stated  you need to follow the documentation   Admittedly it may not be the most straightforward when compared to other class references   The short answer is  you use Date Field Symbol Table to figure out what format you want   Once you do   let dateFormatter   NSDateFormatter     the  M d yy  H mm  is put together from the Symbol Table dateFormatter dateFormat    M d yy  H mm  dateFormatter stringFromDate NSDate      You ll also need to be able to use the table if you need to convert a date that is a string into an NSDate   let dateAsString    02 12 15  16 48  let dateFormatter   NSDateFormatter   dateFormatter dateFormat    M d yyyy  H mm  let date   dateFormatter dateFromString dateAsString

User · Answer

As already mentioned you have to use DateFormatter to format your Date objects  The easiest way to do it is creating a read-only computed property Date extension        Read-Only Computed Properties      A computed property with a getter but no setter is known as a   read-only computed property  A read-only computed property always   returns a value  and can be accessed through dot syntax  but cannot be   set to a different value    Note      You must declare computed properties   including read-only computed   properties   as variable properties with the var keyword  because their   value is not fixed  The let keyword is only used for constant   properties  to indicate that their values cannot be changed once they   are set as part of instance initialization       You can simplify the declaration of a read-only computed property by   removing the get keyword and its braces      extension Formatter       static let date   DateFormatter         extension Date       var europeanFormattedEn US   String           Formatter date calendar   Calendar identifier   iso8601          Formatter date locale     Locale identifier   en US POSIX           Formatter date timeZone    current         Formatter date dateFormat    dd M yyyy  H mm          return Formatter date string from  self              To convert it back you can create another read-only computed property but as a string extension    extension String       var date  Date            return Formatter date date from  self            func dateFormatted with dateFormat  String    dd M yyyy  H mm   calendar  Calendar   Calendar identifier   iso8601   defaultDate  Date    nil  locale  Locale   Locale identifier   en US POSIX    timeZone  TimeZone    current  - gt  Date            Formatter date calendar   calendar         Formatter date defaultDate   defaultDate    calendar date bySettingHour  12  minute  0  second  0  of  Date            Formatter date locale   locale         Formatter date timeZone   timeZone         Formatter date dateFormat   dateFormat         return Formatter date date from  self              Usage   let dateFormatted   Date   europeanFormattedEn US            29 9 2018  16 16  if let date   dateFormatted date       print date description with  current      Saturday  September 29  2018 at 4 16 00 PM Brasilia Standard Time n       date europeanFormattedEn US                             29 9 2018  16 27        let dateString    14 7 2016  if let date   dateString toDateFormatted with   dd M yyyy         print date description with   current       Thursday  July 14  2016 at 12 00 00 PM Brasilia Standard Time n

User · Answer

extension String        func convertDatetring TopreferredFormat currentFormat  String  toFormat   String  - gt   String           let dateFormator   DateFormatter           dateFormator dateFormat   currentFormat         let resultDate   dateFormator date from  self          dateFormator dateFormat   toFormat         return dateFormator string from  resultDate              Call from your view controller file as below    your date string  convertDatetring TopreferredFormat currentFormat   yyyy-MM-dd HH mm ss s   toFormat   dd-MMM-yyyy h mm a

User · Answer

func convertDateFormater date  String  - gt  String          let dateFormatter   NSDateFormatter       dateFormatter dateFormat    yyyy-MM-dd T HH mm ss SSSZ      dateFormatter timeZone   NSTimeZone name   UTC        guard let date   dateFormatter dateFromString date  else           assert false   no date from string           return               dateFormatter dateFormat    yyyy MMM EEEE HH mm      dateFormatter timeZone   NSTimeZone name   UTC       let timeStamp   dateFormatter stringFromDate date       return timeStamp     Edit for Swift 4  func convertDateFormatter date  String  - gt  String       let dateFormatter   DateFormatter       dateFormatter dateFormat    yyyy-MM-dd T HH mm ss   this your string date format     dateFormatter timeZone   NSTimeZone name   UTC   as TimeZone      dateFormatter locale   Locale identifier   your loc id       let convertedDate   dateFormatter date from  date       guard dateFormatter date from  date     nil else           assert false   no date from string           return                dateFormatter dateFormat    yyyy MMM HH mm EEEE    this is what you want to convert format     dateFormatter timeZone   NSTimeZone name   UTC   as TimeZone      let timeStamp   dateFormatter string from  convertedDate        return timeStamp

User · Answer

Added some formats in one place  Hope someone get help  Xcode 12 - Swift 5 3 let dateFormatter   DateFormatter   dateFormatter dateFormat    quot HH mm ss quot  var dateFromStr   dateFormatter date from   quot 12 16 45 quot     dateFormatter dateFormat    quot hh mm ss a  on  MMMM dd  yyyy quot    Output  12 16 45 PM on January 01  2000  dateFormatter dateFormat    quot E  d MMM yyyy HH mm ss Z quot    Output  Sat  1 Jan 2000 12 16 45  0600  dateFormatter dateFormat    quot yyyy-MM-dd T HH mm ssZ quot    Output  2000-01-01T12 16 45 0600  dateFormatter dateFormat    quot EEEE  MMM d  yyyy quot    Output  Saturday  Jan 1  2000  dateFormatter dateFormat    quot MM-dd-yyyy HH mm quot    Output  01-01-2000 12 16  dateFormatter dateFormat    quot MMM d  h mm a quot    Output  Jan 1  12 16 PM  dateFormatter dateFormat    quot HH mm ss SSS quot    Output  12 16 45 000  dateFormatter dateFormat    quot MMM d  yyyy quot    Output  Jan 1  2000  dateFormatter dateFormat    quot MM dd yyyy quot    Output  01 01 2000  dateFormatter dateFormat    quot hh mm ss a quot    Output  12 16 45 PM  dateFormatter dateFormat    quot MMMM yyyy quot    Output  January 2000  dateFormatter dateFormat    quot dd MM yy quot    Output  01 01 00    Output  Customisable AP PM symbols dateFormatter amSymbol    quot am quot  dateFormatter pmSymbol    quot Pm quot  dateFormatter dateFormat    quot a quot    Output  Pm     Usage var timeFromDate   dateFormatter string from  dateFromStr  print timeFromDate

User · Answer

Current date time to formated string   let currentDate   Date   let dateFormatter   DateFormatter    dateFormatter dateFormat    dd MM yyyy hh mm ss a  let convertedDate  String   dateFormatter string from  currentDate    08 10 2016 01 42 22 AM   More Date Time Formats

User · Answer

You have already found NSDateFormatter  just read the documentation on it   NSDateFormatter Class Reference  For format character definitions See  ICU Formatting Dates and Times Also  Date Field SymbolTable

User · Answer

let usDateFormat   DateFormatter dateFormat FromTemplate   MMddyyyy   options  0  locale  Locale identifier   en-US                  usDateFormat now contains an optional string  MM dd yyyy   let gbDateFormat   DateFormatter dateFormat FromTemplate   MMddyyyy   options  0  locale  Locale identifier   en-GB                  gbDateFormat now contains an optional string  dd MM yyyy   let geDateFormat   DateFormatter dateFormat FromTemplate   MMddyyyy   options  0  locale  Locale identifier   de-DE                  geDateFormat now contains an optional string  dd MM yyyy    You can use it in following way to get the current format from device    let currentDateFormat   DateFormatter dateFormat fromTemplate   MMddyyyy   options  0  locale  Locale current

User · Answer

Time Picker In swift class ViewController  UIViewController              timePicker      IBOutlet weak var lblTime  UILabel       IBOutlet weak var timePicker  UIDatePicker       IBOutlet weak var cancelTime Btn  UIBarButtonItem       IBOutlet weak var donetime Btn  UIBarButtonItem       IBOutlet weak var toolBar  UIToolbar             Date picker        IBOutlet weak var datePicker  UIDatePicker           override func viewDidLoad             super viewDidLoad           ishidden bool  true          let dateFormatter2   DateFormatter           dateFormatter2 dateFormat    quot HH mm a quot     quot hh mm a quot          lblTime text   dateFormatter2 string from  timePicker date                           IBAction func selectTime Action   sender  Any            timePicker datePickerMode    time         ishidden bool  false                  IBAction func timeCancel Action   sender  Any            ishidden bool  true                  IBAction func timeDoneBtn   sender  Any            let dateFormatter1   DateFormatter           dateFormatter1 dateFormat     quot HH mm a quot    quot hh mm quot                   let str   dateFormatter1 string from  timePicker date          lblTime text   str                  ishidden bool  true                          func ishidden bool Bool              timePicker isHidden   bool            toolBar isHidden   bool

User · Answer

I used the a similar approach as  iod07  but as an extension  Also  I added some explanations in the comments to understand how it works   Basically  just add this at the top or bottom of your view controller   extension NSString    class func convertFormatOfDate date  String  originalFormat  String  destinationFormat  String  - gt  String            Orginal format       let dateOriginalFormat   NSDateFormatter       dateOriginalFormat dateFormat   originalFormat         in the example it ll take  yy MM dd   from our call          Destination format       let dateDestinationFormat   NSDateFormatter       dateDestinationFormat dateFormat   destinationFormat    in the example it ll take  EEEE dd MMMM yyyy   from our call          Convert current String Date to NSDate     let dateFromString   dateOriginalFormat dateFromString date          Convert new NSDate created above to String with the good format     let dateFormated   dateDestinationFormat stringFromDate dateFromString        return dateFormated        Example  Let s say you want to convert  16 05 05  to  Thursday 05 May 2016  and your date is declared as follow let date    16 06 05   Then simply call call it with     let newDate   NSString convertFormatOfDate date  originalFormat   yy MM dd   destinationFormat   EEEE dd MMMM yyyy     Hope it helps

User · Answer

This is possibly an old thread but I was working on datetimes recently and was stuck with similar issue so I ended up creating a utility of mine which looks like this   This utility would take a string date and would return an optional date object          func toDate dateFormat  DateFormatType  - gt  Date            let formatter   DateFormatter           formatter timeZone   NSTimeZone name   UTC   as TimeZone          formatter dateFormat   dateFormat rawValue         let temp   formatter date from  self          return formatter date from  self              the DateFormatType enum looks like this          enum DateFormatType   String           case type1    yyyy-MM-dd - HH mm ss          case type2    dd MM yyyy          case type3    yyyy MM dd          One important thing I would like to mention here is the line  formatter timeZone   NSTimeZone name   UTC   as TimeZone   it s very important that you add this line because without this the DateFormatter would use it s default conversions to convert the date and you might end up seeing different dates if you are working with a remote team and get all sorts of issues with data depending on dates   Hope this helps

User · Answer

new Date year month day 0 0 0 0  is local time  as input  new Date year month day  is UTC I was using a function to attain YYYY-MM-DD format to be compatible on iOS web  but that is also UTC when used in comparisons  not chained by getFullYear or similar  I ve found it is best to use only the above with strong  hours minutes seconds milliseconds  building a calendar  calculating with a Date objects and local references export const zeroPad    num    gt      var res    quot 0 quot     if  String num  length     1        res    0  num        else       res   num        return res

User · Answer

If you want to use protocol oriented programming  Swift 3  1  Create a Dateable protocol protocol Dateable       func userFriendlyFullDate   - gt  String     func userFriendlyHours   - gt  String    2  Extend Date class and implement the Dateable protocol extension Date  Dateable       var  formatter  DateFormatter   return DateFormatter              Return a user friendly hour        func userFriendlyFullDate   - gt  String              Customize a date formatter         formatter dateFormat    quot yyyy-MM-dd T HH mm ss SSSZ quot          formatter timeZone   TimeZone abbreviation   quot UTC quot            return formatter string from  self                 Return a user friendly hour        func userFriendlyHours   - gt  String              Customize a date formatter         formatter dateFormat    quot HH mm quot          formatter timeZone   TimeZone abbreviation   quot UTC quot            return formatter string from  self                 You can add many cases you need like string to date formatter     3  Use it let currentDate  Date   Date   let stringDate  String   currentDate userFriendlyHours      Print 15 16

User · Answer

Swift 3     This gives month as three letters  Jun  Dec  etc  let justMonth   DateFormatter   justMonth dateFormat    MMM  myFirstLabel text   justMonth string from  myDate     This gives the day of month  with no preceding 0s  6 14 29  let justDay   DateFormatter   justDay dateFormat    d  mySecondLabel text   justDay string from  myDate     This gives year as two digits  preceded by an apostrophe   09   16  etc  let justYear   DateFormatter   justYear dateFormat    yy  myThirdLabel text       justYear string from  lastCompDate      For more formats  check out this link to a codingExplorer table with all the available formats  Each date component has several options  for example   Year      y  - 2016  early dates like year 1 would be   1    yy  - 16  year 1   01   yyy  - 2016  year 1   001    yyyy  - 2016  year 1   0001     Pretty much every component has 2-4 options  using the first letter to express the format  day is  d   hour is  h   etc   However  month is a capital  M   because the lower case  m  is reserved for minute  There are some other exceptions though  so check out the link

User · Answer

iOS 8   It is cumbersome and difficult to specify locale explicitly  You never know where your app will be used  So I think  it is better to set locale to Calender current locale   and  use  DateFormatter s   setLocalizedDateFormatFromTemplate method   setLocalizedDateFormatFromTemplate         Sets the date format from a template using the specified locale for the receiver  - developer apple com   extension Date       func convertToLocaleDate template  String  - gt  String           let dateFormatter   DateFormatter            let calender   Calendar current          dateFormatter timeZone   calender timeZone         dateFormatter locale   calender locale         dateFormatter setLocalizedDateFormatFromTemplate template           return dateFormatter string from  self             Date   convertToLocaleDate template   dd MMMM YYYY

[ios] Swift - iOS - Dates and times in different format

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