NSDate get year month day

Question

How can I get the year month day of a NSDate object  given no other information  I realize that I could probably do this with something similar to this   NSCalendar  cal     NSCalendar alloc  init   NSDateComponents  components    cal components 0 fromDate date   int year    components year   int month    components month   int day    components day     But that seems to be a whole lot of hassle for something as simple as getting a NSDate s year month day  Is there any other solution

User · Answer

Swift  Easier way to get any elements of date as an optional String   extension Date         Year    var currentYear  String        return getDateComponent dateFormat   yy         return getDateComponent dateFormat   yyyy             Month    var currentMonth  String        return getDateComponent dateFormat   M         return getDateComponent dateFormat   MM         return getDateComponent dateFormat   MMM         return getDateComponent dateFormat   MMMM              Day   var currentDay  String        return getDateComponent dateFormat   dd         return getDateComponent dateFormat   d           func getDateComponent dateFormat  String  - gt  String        let format   DateFormatter       format dateFormat   dateFormat     return format string from  self           let today   Date   print  Current Year -   today currentYear        result Current Year - Optional  2017   print  Current Month -   today currentMonth        result Current Month - Optional  7   print  Current Day -   today currentDay        result Current Day - Optional  10

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Here s the solution in Swift   let todayDate   NSDate   let calendar   NSCalendar identifier  NSCalendarIdentifierGregorian       Use a mask to extract the required components  Extract only the required components  since it ll be expensive to compute all available values  let components   calendar components  CalendarUnitYear    CalendarUnitMonth    CalendarUnitDay  fromDate  todayDate   var  year  month  date     components year  components month  components day

User · Answer

Try this        Code snippet    NSDateComponents  components     NSCalendar currentCalendar  components NSCalendarUnitDay   NSCalendarUnitMonth   NSCalendarUnitYear fromDate  NSDate date     int year    components year    int month    components month    int day    components day     It gives current year  month  date

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I m writing this answer because it s the only approach that doesn t give you optionals back from NSDateComponent variables and or force unwrapping those variables  also for Swift 3    Swift 3  let date   Date   let cal   Calendar current let year   cal component  year  from  date  let month   cal component  month  from  date  let day   cal component  day  from  date    Swift 2  let date   NSDate   let cal   NSCalendar currentCalendar   let year   cal component  Year  fromDate  date  let month   cal component  Month  fromDate  date  let day   cal component  Day  fromDate  date    Bonus Swift 3 fun version  let date   Date   let component      unit  in return Calendar current   component unit  from  date    let year   component  year  let month   component  month  let day   component  day

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As of iOS 8 0  and OS X 10  you can use the component method to simplify getting a single date component like so   int year     NSCalendar currentCalendar  component NSCalendarUnitYear fromDate  NSDate date      Should make things simpler and hopefully this is implemented efficiently

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New In iOS 8  ObjC  NSDate  date    NSDate date   NSInteger era  year  month  day    NSCalendar currentCalendar  getEra  amp era year  amp year month  amp month day  amp day fromDate date     Swift  let date   NSDate init   var era   0  year   0  month   0  day   0 NSCalendar currentCalendar   getEra  amp era  year  amp year  month  amp month  day  amp day  fromDate  date

User · Answer

Try the following       NSString  birthday     06 15 1977       NSDateFormatter  formatter     NSDateFormatter alloc  init        formatter setDateFormat   MM dd yyyy        NSDate  date    formatter dateFromString birthday       if date  nil            NSInteger age    date timeIntervalSinceNow  31556926          NSDateComponents  components     NSCalendar currentCalendar  components NSCalendarUnitDay   NSCalendarUnitMonth   NSCalendarUnitYear fromDate date           NSInteger day    components day           NSInteger month    components month           NSInteger year    components year            NSLog   Day  d Month  d Year  d Age  d  day month year age              formatter release

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If you are targeting iOS 8  you can use the new NSCalendar convenience methods to achieve this in a more terse format   First create an NSCalendar and use whatever NSDate is required   NSCalendar  calendar    NSCalendar currentCalendar   NSDate  date    NSDate date     You could extract components individually via component fromDate   NSInteger year    calendar component NSCalendarUnitYear fromDate date   NSInteger month    calendar component NSCalendarUnitMonth fromDate date   NSInteger day    calendar component NSCalendarUnitDay fromDate date     Or  even more succinctly  use NSInteger pointers via getEra year month day fromDate   NSInteger year  month  day   calendar getEra nil year  amp year month  amp month day  amp day fromDate date     For more information and examples check out NSDate Manipulation Made Easy in iOS 8  Disclaimer  I wrote the post

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i do in this way           NSDate   mydate    NSDate date    NSCalendar   mycalendar     NSCalendar alloc  initWithCalendarIdentifier NSGregorianCalendar    NSCalendarUnit units   NSCalendarUnitYear   NSCalendarUnitMonth   NSCalendarUnitDay   NSDateComponents   myComponents     mycalendar components units fromDate mydate    NSLog    d- d- d  myComponents day myComponents month myComponents year

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Swift 2 x  extension NSDate       func currentDateInDayMonthYear   - gt  String           let dateFormatter   NSDateFormatter           dateFormatter dateFormat    d LLLL yyyy          return dateFormatter stringFromDate self            You can use it as   NSDate   currentDateInDayMonthYear     Output  6 March 2016

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To get human readable string  day  month  year   you may do   NSDateFormatter  dateFormatter     NSDateFormatter alloc  init    dateFormatter setDateStyle NSDateFormatterMediumStyle   NSString  string    dateFormatter stringFromDate dateEndDate

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You can get separate component of a NSDate using NSDateFormatter   NSDateFormatter  df     NSDateFormatter alloc  init     df setDateFormat   dd    myDayString    df stringFromDate  NSDate date      df setDateFormat   MMM    myMonthString    df stringFromDate  NSDate date      df setDateFormat   yy    myYearString    df stringFromDate  NSDate date      If you wish to get month s number instead of abbreviation  use  MM   If you wish to get integers  use  myDayString intValue

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If you wish to get the individual NSDateComponents from NSDate  you would definitely need the solution suggested by Itai Ferber  But if you want to go from NSDate directly to an NSString  you can use NSDateFormatter

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Just to reword Itai s excellent  and working   code  here s what a sample helper class would look like  to return the year value of a given NSDate variable   As you can see  it s easy enough to modify this code to get the month or day      int getYear  NSDate  date       NSDateComponents  components     NSCalendar currentCalendar  components NSDayCalendarUnit   NSMonthCalendarUnit   NSYearCalendarUnit fromDate date        int year    components year       int month    components month       int day    components day        return year       I can t believe we re having to write our own basic iOS date functions like this  in 2013      One other thing   don t ever use  lt  and   to compare two NSDate values   XCode will happily accept such code  without any errors or warnings   but its results are a lottery   You must use the  compare  function to compare NSDates   if   date1 compare date2     NSOrderedDescending           date1 is greater than date2

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In Swift 2 0       let date   NSDate       let calendar   NSCalendar identifier  NSCalendarIdentifierGregorian       let components   calendar components   Month   Day   fromDate  date       let  month  day     components month  components day

User · Answer

Because this is apparently my most popular answer  I ll try to edit it to contain a little bit more information   Despite its name  NSDate in and of itself simply marks a point in machine time  not a date  There s no correlation between the point in time specified by an NSDate and a year  month  or day  For that  you have to refer to a calendar  Any given point in time will return different date information based on what calendar you re looking at  dates are not the same in both the Gregorian and Jewish calendars  for instance   and while the Gregorian calendar is the most widely used calendar in the world - I m assuming - we re a little biased that NSDate should always use it  NSDate  luckily  is far more bipartisan     Getting date and time is going to have to pass through NSCalendar  as you mentioned  but there s a simpler way to do it   NSDateComponents  components     NSCalendar currentCalendar  components NSCalendarUnitDay   NSCalendarUnitMonth   NSCalendarUnitYear fromDate  NSDate date      That generates an NSDateComponents object containing the day  month  and year from the current system calendar for the current day   Note  this isn t necessarily the current user-specified calendar  just the default system one    Of course  if you re using a different calendar or date  you can easily change that  A list of  available calendars and calendar units can be found in the NSCalendar Class Reference  More information about NSDateComponents can be found in the NSDateComponents Class Reference     For reference  accessing individual components from the NSDateComponents is rather easy   NSInteger day    components day   NSInteger month    components month   NSInteger year    components year     You just have to be mindful  NSDateComponents won t contain valid information for any fields you ask for unless you generated them with that valid information  i e  request NSCalendar to provide that information with NSCalendarUnits   NSDateComponents contain no reference information in and of themselves - they re just simple structures that hold numbers for you to access  If you want to also get an era  for instance  out of NSDateComponents  you ll have to feed the generator method from NSCalendar with the NSCalendarUnitEra flag

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NSDate  currDate    NSDate date       NSCalendar        calendar     NSCalendar alloc  initWithCalendarIdentifier NSGregorianCalendar       NSDateComponents  components    calendar components NSDayCalendarUnit NSMonthCalendarUnit NSYearCalendarUnit fromDate currDate       NSInteger         day    components day       NSInteger         month    components month       NSInteger         year    components year       NSLog    d  d  d   day  month  year

[objective-c] NSDate get year/month/day

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