Swift days between two NSDates

Question

I m wondering if there is some new and awesome possibility to get the amount of days between two NSDates in Swift   the  new  Cocoa   E g  like in Ruby I would do    end date - start date  to i

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All answer is good  But for Localizations we need calculates a number of decimal days in between two dates  so we can provide the sustainable decimal format      This method returns the fractional number of days between to dates func getFractionalDaysBetweenDates date1  Date  date2  Date  - gt  Double        let components   Calendar current dateComponents   day   hour   from  date1  to  date2       var decimalDays   Double components day       decimalDays    Double components hour     24 0      return decimalDays

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let calendar   NSCalendar currentCalendar    let component1   calendar component  Day  fromDate  fromDate  let component2   calendar component  Day  fromDate  toDate  let difference    component1 - component2

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Swift 3 - Days from today until date  func daysUntilDate endDateComponents  DateComponents  - gt  Int               let cal   Calendar current         var components   cal dateComponents   era   year   month   day   from  NSDate   as Date          let today   cal date from  components          let otherDate   cal date from  endDateComponents           components   cal dateComponents  Calendar Component day   from   today  as Date   to  otherDate           return components day          Call function like this     Days from today until date    var examnDate   DateComponents      examnDate year   2016    examnDate month   12    examnDate day   15    let daysCount   daysUntilDate endDateComponents  examnDate

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Here is the answer for Swift 3  tested for IOS 10 Beta   func daysBetweenDates startDate  Date  endDate  Date  - gt  Int       let calendar   Calendar current     let components   calendar components   day   from  startDate  to  endDate  options          return components day      Then you can call it like this  let pickedDate  Date   sender date let NumOfDays  Int   daysBetweenDates startDate  pickedDate  endDate  Date        print  Num of Days    NumOfDays

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I translated my Objective-C answer  let start    2010-09-01  let end    2010-09-05   let dateFormatter   NSDateFormatter   dateFormatter dateFormat    yyyy-MM-dd   let startDate NSDate   dateFormatter dateFromString start  let endDate NSDate   dateFormatter dateFromString end   let cal   NSCalendar currentCalendar     let unit NSCalendarUnit    Day  let components   cal components unit  fromDate  startDate  toDate  endDate  options  nil    println components    result    lt NSDateComponents  0x10280a8a0 gt       Day  4   The hardest part was that the autocompletion insists fromDate and toDate would be NSDate   but indeed they must be NSDate  as shown in the reference    I don t see how a good solution with an operator would look like  as you want to specify the unit differently in each case  You could return the time interval  but than won t you gain much

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Swift 5 Working  you need to set the time to be the same for both days  if you are off by seconds it will be wrong func daysBetween start  Date  end  Date  - gt  Int       let start   Calendar current date bySettingHour  0  minute  0  second  0  of  start       let end   Calendar current date bySettingHour  0  minute  0  second  0  of  end       return Calendar current dateComponents   day   from  start  to  end  day    0

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Here is my answer for Swift 2   func daysBetweenDates startDate  NSDate  endDate  NSDate  - gt  Int       let calendar   NSCalendar currentCalendar        let components   calendar components   Day   fromDate  startDate  toDate  endDate  options           return components day

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You have to consider the time difference as well  For example if you compare the dates 2015-01-01 10 00 and 2015-01-02 09 00  days between those dates will return as 0  zero  since the difference between those dates is less than 24 hours  it s 23 hours    If your purpose is to get the exact day number between two dates  you can work around this issue like this       Assuming that firstDate and secondDate are defined         let calendar   NSCalendar currentCalendar       Replace the hour  time  of both dates with 00 00 let date1   calendar startOfDayForDate firstDate  let date2   calendar startOfDayForDate secondDate   let flags   NSCalendarUnit Day let components   calendar components flags  fromDate  date1  toDate  date2  options       components day     This will return the number of day s  between dates   Swift 3 and Swift 4 Version  let calendar   Calendar current     Replace the hour  time  of both dates with 00 00 let date1   calendar startOfDay for  firstDate  let date2   calendar startOfDay for  secondDate   let components   calendar dateComponents   day   from  date1  to  date2

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The things built into swift are still very basic  As they should be at this early stage  But you can add your own stuff with the risk that comes with overloading operators and global domain functions  They will be local to your module though   let now   NSDate   let seventies   NSDate timeIntervalSince1970  0      Standard solution still works let days   NSCalendar currentCalendar   components  CalendarUnitDay              fromDate  seventies  toDate  now  options  nil  day     Flashy swift    maybe    func - lhs NSDate  rhs NSDate  - gt  DateRange       return DateRange startDate  rhs  endDate  lhs     class DateRange       let startDate NSDate     let endDate NSDate     var calendar   NSCalendar currentCalendar       var days  Int           return calendar components  CalendarUnitDay                  fromDate  startDate  toDate  endDate  options  nil  day           var months  Int           return calendar components  CalendarUnitMonth                  fromDate  startDate  toDate  endDate  options  nil  month           init startDate NSDate  endDate NSDate            self startDate   startDate         self endDate   endDate             Now you can do this     now - seventies  months  now - seventies  days

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Swift 3 2  extension DateComponentsFormatter       func difference from fromDate  Date  to toDate  Date  - gt  String            self allowedUnits     year  month  weekOfMonth  day          self maximumUnitCount   1         self unitsStyle    full         return self string from  fromDate  to  toDate

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There s hardly any Swift-specific standard library yet  just the lean basic numeric  string  and collection types   It s perfectly possible to define such shorthands using extensions  but as far as the actual out-of-the-box APIs goes  there is no  new  Cocoa  Swift just maps directly to the same old verbose Cocoa APIs as they already exist

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I see a couple Swift3 answers so I ll add my own  public static func daysBetween start  Date  end  Date  - gt  Int      Calendar current dateComponents   day   from  start  to  end  day     The naming feels more Swifty  it s one line  and using the latest dateComponents   method

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2017 version  copy and paste func simpleIndex ofDate  Date  - gt  Int               index here just means today 0  yesterday -1  tomorrow 1 etc           let c   Calendar current     let todayRightNow   Date            let d   c date bySetting   hour  value  13  of  ofDate      let t   c date bySetting   hour  value  13  of  todayRightNow           if d    nil    today    nil                print  quot weird problem simpleIndex ofDate quot           return 0                let r   c dateComponents   day   from  today   to  d          yesterday is negative one  tomorrow is one          if let o   r value for   day                     return o           else                print  quot another weird problem simpleIndex ofDate quot           return 0

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extension Date       func daysFromToday   - gt  Int           return Calendar current dateComponents   day   from  self  to  Date    day            Then use it like      func dayCount dateString  String  - gt  String          let dateFormatter   DateFormatter           dateFormatter dateFormat    MMM dd yyyy hh mm a          let fetchedDate   dateFormatter date from  dateString            let day   fetchedDate  daysFromToday           if day   gt  -1              return    day   days passed            else          return    day    -1  days left

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I m going to add my version even though this thread is a year old   My code looks like this       var name   txtName stringValue    Get the users name         Get the date components from the window controls     var dateComponents   NSDateComponents       dateComponents day   txtDOBDay integerValue     dateComponents month   txtDOBMonth integerValue     dateComponents year   txtDOBYear integerValue         Make a Gregorian calendar     let calendar   NSCalendar identifier  NSCalendarIdentifierGregorian          Get the two dates we need     var birthdate   calendar  dateFromComponents dateComponents      let currentDate   NSDate        var durationDateComponents   calendar  components NSCalendarUnit CalendarUnitDay  fromDate  birthdate   toDate  currentDate  options  nil       let numberOfDaysAlive   durationDateComponents  day      println    numberOfDaysAlive          txtGreeting stringValue    Hello   name   You have been alive for   numberOfDaysAlive   days     I hope it helps someone   Cheers

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easier option would be to create a extension on Date  public extension Date            public var currentCalendar  Calendar               return Calendar autoupdatingCurrent                    public func daysBetween   date  Date  - gt  Int               let components   currentCalendar dateComponents   day   from  self  to  date              return components day

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You could use the following extension   public extension Date       func daysTo   date  Date  - gt  Int            let calendar   Calendar current             Replace the hour  time  of both dates with 00 00         let date1   calendar startOfDay for  self          let date2   calendar startOfDay for  date           let components   calendar dateComponents   day   from  date1  to  date2          return components day     This will return the number of day s  between dates           Then  you can call it like this   startDate daysTo endDate

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func completeOffset from date Date  - gt  String         let formatter   DateComponentsFormatter       formatter unitsStyle    brief      return  formatter string from  Calendar current dateComponents   year  month  day  hour  minute  second   from  date  to  self           if you need year month days and hours as string use this   var tomorrow   Calendar current date byAdding   day  value  1  to  Date      let dc   tomorrow completeOffset from  Date

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Swift 5 2 4 solution  import UIKit  let calendar   Calendar current  let start    quot 2010-09-01 quot  let end    quot 2010-09-05 quot   let dateFormatter   DateFormatter   dateFormatter dateFormat    quot yyyy-MM-dd quot   let firstDate   dateFormatter date from  start   let secondDate   dateFormatter date from  end       Replace the hour  time  of both dates with 00 00 let date1   calendar startOfDay for  firstDate  let date2   calendar startOfDay for  secondDate   let components   calendar dateComponents  Calendar Component day   from  date1  to  date2   components day     This will return the number of day s  between dates

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Update for Swift 3 iOS 10 Beta 4  func daysBetweenDates startDate  Date  endDate  Date  - gt  Int       let calendar   Calendar current     let components   calendar dateComponents  Calendar Component day   from  startDate  to  endDate      return components day

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This returns an absolute difference in days between some Date and today   extension Date     func daysFromToday   - gt  Int       return abs Calendar current dateComponents   day   from  self  to  Date    day           and then use it   if someDate daysFromToday    gt   7        at least a week from today

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Swift 5  Thanks to Emin Bugra Saral above for the startOfDay suggestion  extension Date            func daysBetween date  Date  - gt  Int           return Date daysBetween start  self  end  date                 static func daysBetween start  Date  end  Date  - gt  Int           let calendar   Calendar current                     Replace the hour  time  of both dates with 00 00         let date1   calendar startOfDay for  start          let date2   calendar startOfDay for  end                   let a   calendar dateComponents   day   from  date1  to  date2          return a value for   day            Usage  let dateFormatter   DateFormatter   dateFormatter dateFormat    quot yyyy-MM-dd quot  let start   dateFormatter date from   quot 2017-01-01 quot    let end   dateFormatter date from   quot 2018-01-01 quot     let diff   Date daysBetween start  start  end  end     365    or let diff   start daysBetween date  end     365

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Erin s method updated to Swift 3  This shows days from today  disregarding time of day   func daysBetweenDates  endDate  Date  - gt  Int      let calendar  Calendar   Calendar current      let date1   calendar startOfDay for  Date         let date2   calendar startOfDay for  secondDate       return calendar dateComponents   day   from  date1  to  date2  day

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Nice handy one liner    extension Date     var daysFromNow  Int       return Calendar current dateComponents   day   from  Date    to  self  day

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This is an updated version of Emin s answer for Swift 5 that incorporates the suggestion to use noon instead of midnight as the definitive time for comparing days  It also handles the potential failure of various date functions by returning an optional                   This is an approximation  it does not account for time differences  It will set the time to 1200  noon  and provide the absolute number         of days between now and the given date  If the result is negative  it should be read as  days ago  instead of  days from today           Returns nil if something goes wrong initializing or adjusting dates               func daysFromToday   - gt  Int                let calendar   NSCalendar current             Replace the hour  time  of both dates with noon   Noon is less likely to be affected by DST changes  timezones  etc  than midnight           guard let date1   calendar date bySettingHour  12  minute  00  second  00  of  calendar startOfDay for  Date                    let date2   calendar date bySettingHour  12  minute  00  second  00  of  calendar startOfDay for  self   else                       return nil                    return calendar dateComponents   day   from  date1  to  date2  day

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Here is very nice  Date extension to get difference between dates in years  months  days  hours  minutes  seconds  extension Date        func years sinceDate  Date  - gt  Int            return Calendar current dateComponents   year   from  sinceDate  to  self  year            func months sinceDate  Date  - gt  Int            return Calendar current dateComponents   month   from  sinceDate  to  self  month            func days sinceDate  Date  - gt  Int            return Calendar current dateComponents   day   from  sinceDate  to  self  day            func hours sinceDate  Date  - gt  Int            return Calendar current dateComponents   hour   from  sinceDate  to  self  hour            func minutes sinceDate  Date  - gt  Int            return Calendar current dateComponents   minute   from  sinceDate  to  self  minute            func seconds sinceDate  Date  - gt  Int            return Calendar current dateComponents   second   from  sinceDate  to  self  second

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Here is my answer for Swift 3   func daysBetweenDates startDate  NSDate  endDate  NSDate  inTimeZone timeZone  TimeZone    nil  - gt  Int       var calendar   Calendar current     if let timeZone   timeZone           calendar timeZone   timeZone           let dateComponents   calendar dateComponents   day   from  startDate startOfDay  to  endDate startOfDay      return dateComponents day

[ios] Swift days between two NSDates

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