Getting the difference between two Dates months days hours minutes seconds in Swift

Question

I am trying to get the difference between the current date as NSDate   and a date from a PHP time    call for example  NSDate timeIntervalSinceReferenceDate  1417147270   How do I go about getting the difference in time between the two dates  I d like to have a function that compares the two dates and if seconds  gt  60  then it returns minutes  if minutes  gt  60  return hours and if hours  gt  24  return days and so on    How should I go about this   EDIT  The current accepted answer has done exactly what I ve wanted to do  I recommend it for easy usage for getting the time between two dates in the form that that PHP time   function uses  If you aren t particularly familiar with PHP  that s the time in seconds from January 1st  1970  This is beneficial for a backend in PHP  If perhaps you re using a backend like NodeJS you might want to consider some of the other options you ll find below

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Slightly modified code for Swift 3 0  let calendar   NSCalendar current as NSCalendar     Replace the hour  time  of both dates with 00 00 let date1   calendar startOfDay for  startDateTime  let date2   calendar startOfDay for  endDateTime   let flags   NSCalendar Unit day let components   calendar components flags  from  date1  to  date2  options       return components day

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If someone needs to display all time units e g  hours minutes seconds  not just  hours   Let s say the time difference between two dates is 1hour 59minutes 20seconds  This function will display  1h 59m 20s     Here is my Objective-C code   extension NSDate        func offsetFrom date  NSDate  - gt  String            let dayHourMinuteSecond  NSCalendarUnit     Day   Hour   Minute   Second          let difference   NSCalendar currentCalendar   components dayHourMinuteSecond  fromDate  date  toDate  self  options               let seconds      difference second s          let minutes      difference minute m          seconds         let hours      difference hour h          minutes         let days      difference day d          hours          if difference day     gt  0   return days           if difference hour    gt  0   return hours           if difference minute  gt  0   return minutes           if difference second  gt  0   return seconds           return                 In Swift 3    extension Date        func offsetFrom date  Date  - gt  String            let dayHourMinuteSecond  Set lt Calendar Component gt      day   hour   minute   second          let difference   NSCalendar current dateComponents dayHourMinuteSecond  from  date  to  self           let seconds      difference second    0 s          let minutes      difference minute    0 m          seconds         let hours      difference hour    0 h          minutes         let days      difference day    0 d          hours          if let day   difference day  day           gt  0   return days           if let hour   difference hour  hour        gt  0   return hours           if let minute   difference minute  minute  gt  0   return minutes           if let second   difference second  second  gt  0   return seconds           return

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In Swift 2 2          Returns the amount of years from another date func years fromdate  NSDate  - gt  Int       return NSCalendar currentCalendar   components   Year   fromDate  fromdate  toDate  NSDate    options      year    0       Returns the amount of months from another date func months fromdate  NSDate  - gt  Int       return NSCalendar currentCalendar   components   Month   fromDate  fromdate  toDate  NSDate    options      month    0       Returns the amount of weeks from another date func weeks fromdate  NSDate  - gt  Int       return NSCalendar currentCalendar   components   WeekOfYear   fromDate  fromdate  toDate  NSDate    options      weekOfYear    0       Returns the amount of days from another date func days fromdate  NSDate  - gt  Int       return NSCalendar currentCalendar   components   Day   fromDate  fromdate  toDate  NSDate    options      day    0       Returns the amount of hours from another date func hours fromdate  NSDate  - gt  Int       return NSCalendar currentCalendar   components   Hour   fromDate  fromdate  toDate  NSDate    options      hour    0       Returns the amount of minutes from another date func minutes fromdate  NSDate  - gt  Int       return NSCalendar currentCalendar   components   Minute   fromDate  fromdate  toDate  NSDate    options      minute    0       Returns the amount of seconds from another date func seconds fromdate  NSDate  - gt  Int       return NSCalendar currentCalendar   components  Second  fromDate  fromdate  toDate  NSDate    options      second    0

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A small addition to Leo Dabus  answer to provide the plural versions and be more human readable   Swift 3  extension Date           Returns the amount of years from another date     func years from date  Date  - gt  Int           return Calendar current dateComponents   year   from  date  to  self  year    0               Returns the amount of months from another date     func months from date  Date  - gt  Int           return Calendar current dateComponents   month   from  date  to  self  month    0               Returns the amount of weeks from another date     func weeks from date  Date  - gt  Int           return Calendar current dateComponents   weekOfMonth   from  date  to  self  weekOfMonth    0               Returns the amount of days from another date     func days from date  Date  - gt  Int           return Calendar current dateComponents   day   from  date  to  self  day    0               Returns the amount of hours from another date     func hours from date  Date  - gt  Int           return Calendar current dateComponents   hour   from  date  to  self  hour    0               Returns the amount of minutes from another date     func minutes from date  Date  - gt  Int           return Calendar current dateComponents   minute   from  date  to  self  minute    0               Returns the amount of seconds from another date     func seconds from date  Date  - gt  Int           return Calendar current dateComponents   second   from  date  to  self  second    0               Returns the a custom time interval description from another date     func offset from date  Date  - gt  String           if years from  date       1   return    years from  date   year      else if years from  date     gt  1   return    years from  date   years              if months from  date      1   return    months from  date   month     else if months from  date    gt  1   return    months from  date   month             if weeks from  date       1   return    weeks from  date   week      else if weeks from  date     gt  1   return    weeks from  date   weeks              if days from  date        1   return    days from  date   day       else if days from  date      gt  1   return    days from  date   days               if hours from  date       1   return    hours from  date   hour      else if hours from  date     gt  1   return    hours from  date   hours              if minutes from  date     1   return    minutes from  date   minute    else if minutes from  date   gt  1   return    minutes from  date   minutes            return

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I added a  long  version to Leo Dabus s asnwer in case you want to have a string that says something like  2 weeks ago  instead of just  2w      extension Date           Returns the amount of years from another date     func years from date  Date  - gt  Int           return Calendar current dateComponents   year   from  date  to  self  year    0               Returns the amount of months from another date     func months from date  Date  - gt  Int           return Calendar current dateComponents   month   from  date  to  self  month    0               Returns the amount of weeks from another date     func weeks from date  Date  - gt  Int           return Calendar current dateComponents   weekOfYear   from  date  to  self  weekOfYear    0               Returns the amount of days from another date     func days from date  Date  - gt  Int           return Calendar current dateComponents   day   from  date  to  self  day    0               Returns the amount of hours from another date     func hours from date  Date  - gt  Int           return Calendar current dateComponents   hour   from  date  to  self  hour    0               Returns the amount of minutes from another date     func minutes from date  Date  - gt  Int           return Calendar current dateComponents   minute   from  date  to  self  minute    0               Returns the amount of seconds from another date     func seconds from date  Date  - gt  Int           return Calendar current dateComponents   second   from  date  to  self  second    0               Returns the a custom time interval description from another date     func offset from date  Date  - gt  String           if years from  date     gt  0   return    years from  date  y              if months from  date    gt  0   return    months from  date  M             if weeks from  date     gt  0   return    weeks from  date  w              if days from  date      gt  0   return    days from  date  d               if hours from  date     gt  0   return    hours from  date  h              if minutes from  date   gt  0   return    minutes from  date  m            if seconds from  date   gt  0   return    seconds from  date  s            return               func offsetLong from date  Date  - gt  String           if years from  date     gt  0   return years from  date   gt  1      years from  date   years ago       years from  date   year ago            if months from  date    gt  0   return months from  date   gt  1      months from  date   months ago       months from  date   month ago            if weeks from  date     gt  0   return weeks from  date   gt  1      weeks from  date   weeks ago       weeks from  date   week ago              if days from  date      gt  0   return days from  date   gt  1      days from  date   days ago       days from  date   day ago            if hours from  date     gt  0   return hours from  date   gt  1      hours from  date   hours ago       hours from  date   hour ago              if minutes from  date   gt  0   return minutes from  date   gt  1      minutes from  date   minutes ago       minutes from  date   minute ago            if seconds from  date   gt  0   return seconds from  date   gt  1      seconds from  date   seconds ago       seconds from  date   second ago            return

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This is the shorter version  Basically I  try to get the difference between the post timestamp with the Date   now      MARK  - UPDATE Time Stamp static func updateTimeStampPost postTimeStamp  Date     completion     finalString  String   - gt  Void           date in the current state     let date   Date       let dateComponentFormatter   DateComponentsFormatter           change the styling date  wether second minute or hour     dateComponentFormatter unitsStyle    abbreviated     dateComponentFormatter allowedUnits     second   minute   hour   day   weekOfMonth      dateComponentFormatter maximumUnitCount   1         return the date new format as a string in the completion     completion dateComponentFormatter string from  postTimeStamp   to  date

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You ask      I d like to have a function that compares the two dates and if seconds   60  then it returns minutes  if minutes   60  return hours and if hours   24  return days and so on    I m assuming that you re trying to build a string representation of the elapsed time between two dates  Rather than writing your own code to do that  Apple already has a class designed to do precisely that  Namely  use DateComponentsFormatter  set allowedUnits to whatever values make sense to your app  set unitsStyle to whatever you want  e g   full   and then call string from to     E g  in Swift 3   let previousDate       let now   Date    let formatter   DateComponentsFormatter   formatter unitsStyle    full formatter allowedUnits     month   day   hour   minute   second  formatter maximumUnitCount   2      often  you don t care about seconds if the elapsed time is in months  so you ll set max unit to whatever is appropriate in your case  let string   formatter string from  previousDate  to  now    This also will localize the string appropriate for the device in question   Or  in Swift 2 3   let previousDate       let now   NSDate    let formatter   NSDateComponentsFormatter   formatter unitsStyle    Full formatter allowedUnits     Month   Day   Hour   Minute   Second  formatter maximumUnitCount   2  let string   formatter stringFromDate previousDate  toDate  now      If you re looking for the actual numeric values  just use dateComponents  E g  in Swift 3   let components   Calendar current dateComponents   month   day   hour   minute   second   from  previousDate  to  now    Or  in Swift 2 3   let components   NSCalendar currentCalendar   components   Month   Day   Hour   Minute   Second   fromDate  previousDate  toDate  now  options

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Here is my answer for the Swift 3 answers above    This is current as of Nov 2016   Xcode release was 8 2 Beta  8C23    Used some of both Sagar and Emin suggestions above and sometimes had to let Xcode autocomplete to suggest the syntax   It seemed like the syntax really changed to this beta version   buyDate I got from a DatePicker   let calendar   NSCalendar current as NSCalendar let currentDate   Date   let date1   calendar startOfDay for  buyDate   let date2   calendar startOfDay for  currentDate        let flags   NSCalendar Unit day let components   calendar components flags  from  date1  to  date2  NSLog   day    components day

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With Swift 3  according to your needs  you may choose one of the two following ways to solve your problem   1  Display the difference between two dates to the user You can use a DateComponentsFormatter to create strings for your app   s interface  DateComponentsFormatter has a maximumUnitCount property with the following declaration  var maximumUnitCount  Int   get set     Use this property to limit the number of units displayed in the resulting string  For example  with this property set to 2  instead of    1h 10m  30s     the resulting string would be    1h 10m     Use this property when you are constrained for space or want to round up values to the nearest large unit   By setting maximumUnitCount s value to 1  you are guaranteed to display the difference in only one DateComponentsFormatter s unit  years  months  days  hours or minutes   The Playground code below shows how to display the difference between two dates  import Foundation  let oldDate   Date timeIntervalSinceReferenceDate  -16200  let newDate   Date timeIntervalSinceReferenceDate  0   let dateComponentsFormatter   DateComponentsFormatter   dateComponentsFormatter allowedUnits    NSCalendar Unit year   month   day   hour   minute  dateComponentsFormatter maximumUnitCount   1 dateComponentsFormatter unitsStyle   DateComponentsFormatter UnitsStyle full let timeDifference   dateComponentsFormatter string from  oldDate  to  newDate   print String reflecting  timeDifference      prints Optional  quot 5 hours quot    Note that DateComponentsFormatter rounds up the result  Therefore  a difference of 4 hours and 30 minutes will be displayed as 5 hours  If you need to repeat this operation  you can refactor your code  import Foundation  struct Formatters        static let dateComponentsFormatter  DateComponentsFormatter             let dateComponentsFormatter   DateComponentsFormatter           dateComponentsFormatter allowedUnits    NSCalendar Unit year   month   day   hour   minute          dateComponentsFormatter maximumUnitCount   1         dateComponentsFormatter unitsStyle   DateComponentsFormatter UnitsStyle full         return dateComponentsFormatter             extension Date            func offset from  Date  - gt  String            return Formatters dateComponentsFormatter string from  oldDate  to  self                let oldDate   Date timeIntervalSinceReferenceDate  -16200  let newDate   Date timeIntervalSinceReferenceDate  0   let timeDifference   newDate offset from  oldDate  print String reflecting  timeDifference      prints Optional  quot 5 hours quot     2  Get the difference between two dates without formatting If you don t need to display with formatting the difference between two dates to the user  you can use Calendar  Calendar has a method dateComponents   from to   that has the following declaration  func dateComponents   components  Set lt Calendar Component gt   from start  Date  to end  Date  - gt  DateComponents   Returns the difference between two dates   The Playground code below that uses dateComponents   from to   shows how to retrieve the difference between two dates by returning the difference in only one type of Calendar Component  years  months  days  hours or minutes   import Foundation  let oldDate   Date timeIntervalSinceReferenceDate  -16200  let newDate   Date timeIntervalSinceReferenceDate  0   let descendingOrderedComponents    Calendar Component year   month   day   hour   minute  let dateComponents   Calendar current dateComponents Set descendingOrderedComponents   from  oldDate  to  newDate  let arrayOfTuples   descendingOrderedComponents map     0  dateComponents value for   0      for  component  value  in arrayOfTuples       if let value   value  value  gt  0           print component  value     prints hour 4         break          If you need to repeat this operation  you can refactor your code  import Foundation  extension Date            func offset from  Date  - gt   Calendar Component  Int             let descendingOrderedComponents    Calendar Component year   month   day   hour   minute          let dateComponents   Calendar current dateComponents Set descendingOrderedComponents   from  from  to  self          let arrayOfTuples   descendingOrderedComponents map     0  dateComponents value for   0                      for  component  value  in arrayOfTuples               if let value   value  value  gt  0                   return  component  value                                           return nil           let oldDate   Date timeIntervalSinceReferenceDate  -16200  let newDate   Date timeIntervalSinceReferenceDate  0   if let  component  value    newDate offset from  oldDate        print component  value     prints hour 4

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--  Use this to find time gap between two dates in Swift With two Strings    func timeGapBetweenDates previousDate   String currentDate   String        let dateString1   previousDate     let dateString2   currentDate      let Dateformatter   DateFormatter       Dateformatter dateFormat    yyyy-MM-dd HH mm ss        let date1   Dateformatter date from  dateString1      let date2   Dateformatter date from  dateString2        let distanceBetweenDates  TimeInterval    date2  timeIntervalSince date1       let secondsInAnHour  Double   3600     let minsInAnHour  Double   60     let secondsInDays  Double   86400     let secondsInWeek  Double   604800     let secondsInMonths   Double   2592000     let secondsInYears   Double   31104000      let minBetweenDates   Int  distanceBetweenDates    minsInAnHour       let hoursBetweenDates   Int  distanceBetweenDates    secondsInAnHour       let daysBetweenDates   Int  distanceBetweenDates    secondsInDays       let weekBetweenDates   Int  distanceBetweenDates    secondsInWeek       let monthsbetweenDates   Int  distanceBetweenDates    secondsInMonths       let yearbetweenDates   Int  distanceBetweenDates    secondsInYears       let secbetweenDates   Int distanceBetweenDates           if yearbetweenDates  gt  0               print yearbetweenDates  years    0 years           else if monthsbetweenDates  gt  0               print monthsbetweenDates  months    0 months           else if weekBetweenDates  gt  0               print weekBetweenDates  weeks    0 weeks           else if daysBetweenDates  gt  0               print daysBetweenDates  days    5 days           else if hoursBetweenDates  gt  0               print hoursBetweenDates  hours    120 hours           else if minBetweenDates  gt  0               print minBetweenDates  minutes    7200 minutes           else if secbetweenDates  gt  0               print secbetweenDates  seconds    seconds

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Some addition in jose920405 answer to make it compatible with Swift 3 0 and above func getDateTimeDiff dateStr String  - gt  String            let formatter   DateFormatter   DateFormatter       formatter timeZone   NSTimeZone local     formatter dateFormat    quot yyyy-MM-dd HH mm ss quot           let now   formatter string from  NSDate   as Date      let startDate   formatter date from  dateStr      let endDate   formatter date from  now                  create calendar object         var calendar   NSCalendar current                 Get components using current Local  amp  Timezone         print calendar dateComponents   year   month   day   hour   minute   second   from  startDate                    define calendar components to use as well Timezone to UTC         let unitFlags   Set lt Calendar Component gt    year   month   day   hour   minute   second       calendar timeZone   TimeZone identifier   quot UTC quot        let dateComponents   calendar dateComponents unitFlags  from  startDate   to  endDate                   Get Individual components from date         let years   dateComponents year      let months   dateComponents month      let days   dateComponents day      let hours   dateComponents hour      let minutes   dateComponents minute      let seconds   dateComponents second           var timeAgo    quot  quot           if  seconds  gt  0           if seconds  lt  2               timeAgo    quot Second Ago quot                    else              timeAgo    quot   seconds  Second Ago quot                           if  minutes  gt  0           if minutes  lt  2               timeAgo    quot Minute Ago quot                    else              timeAgo    quot   minutes  Minutes Ago quot                           if hours  gt  0           if hours  lt  2               timeAgo    quot Hour Ago quot                    else              timeAgo    quot   hours  Hours Ago quot                           if  days  gt  0            if days  lt  2               timeAgo    quot Day Ago quot                    else              timeAgo    quot   days  Days Ago quot                           if months  gt  0           if months  lt  2               timeAgo    quot Month Ago quot                    else              timeAgo    quot   months  Months Ago quot                           if years  gt  0           if years  lt  2               timeAgo    quot Year Ago quot                    else              timeAgo    quot   years  Years Ago quot                           DLog  quot timeAgo is     gt    timeAgo  quot       return timeAgo

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Xcode 8 3     Swift 3 1 or later You can use Calendar to help you create an extension to do your date calculations as follow  extension Date           Returns the amount of years from another date     func years from date  Date  - gt  Int           return Calendar current dateComponents   year   from  date  to  self  year    0               Returns the amount of months from another date     func months from date  Date  - gt  Int           return Calendar current dateComponents   month   from  date  to  self  month    0               Returns the amount of weeks from another date     func weeks from date  Date  - gt  Int           return Calendar current dateComponents   weekOfMonth   from  date  to  self  weekOfMonth    0               Returns the amount of days from another date     func days from date  Date  - gt  Int           return Calendar current dateComponents   day   from  date  to  self  day    0               Returns the amount of hours from another date     func hours from date  Date  - gt  Int           return Calendar current dateComponents   hour   from  date  to  self  hour    0               Returns the amount of minutes from another date     func minutes from date  Date  - gt  Int           return Calendar current dateComponents   minute   from  date  to  self  minute    0               Returns the amount of seconds from another date     func seconds from date  Date  - gt  Int           return Calendar current dateComponents   second   from  date  to  self  second    0               Returns the a custom time interval description from another date     func offset from date  Date  - gt  String           if years from  date     gt  0   return  quot   years from  date  y quot              if months from  date    gt  0   return  quot   months from  date  M quot             if weeks from  date     gt  0   return  quot   weeks from  date  w quot              if days from  date      gt  0   return  quot   days from  date  d quot               if hours from  date     gt  0   return  quot   hours from  date  h quot              if minutes from  date   gt  0   return  quot   minutes from  date  m quot            if seconds from  date   gt  0   return  quot   seconds from  date  s quot            return  quot  quot            Using Date Components Formatter let dateComponentsFormatter   DateComponentsFormatter   dateComponentsFormatter allowedUnits     second   minute   hour   day   weekOfMonth   month   year  dateComponentsFormatter maximumUnitCount   1 dateComponentsFormatter unitsStyle    full dateComponentsFormatter string from  Date    to  Date timeIntervalSinceNow  4000000        quot 1 month quot    let date1   DateComponents calendar   current  year  2014  month  11  day  28  hour  5  minute  9  date  let date2   DateComponents calendar   current  year  2015  month  8  day  28  hour  5  minute  9  date   let years   date2 years from  date1         0 let months   date2 months from  date1       9 let weeks   date2 weeks from  date1         39 let days   date2 days from  date1           273 let hours   date2 hours from  date1         6 553 let minutes   date2 minutes from  date1     393 180 let seconds   date2 seconds from  date1     23 590 800  let timeOffset   date2 offset from  date1      quot 9M quot   let date3   DateComponents calendar   current  year  2014  month  11  day  28  hour  5  minute  9  date  let date4   DateComponents calendar   current  year  2015  month  11  day  28  hour  5  minute  9  date   let timeOffset2   date4 offset from  date3      quot 1y quot   let date5   DateComponents calendar   current  year  2017  month  4  day  28  date  let now   Date   let timeOffset3   now offset from  date5      quot 1w quot

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Use this code   let registrationDateString    2008-10-06 00 00 00      let dateFormatter   DateFormatter       dateFormatter dateFormat    yyyy-MM-dd hh mm ss      if let registrationDate   dateFormatter date from  registrationDateString            let currentDate   Date           let dateDifference   Calendar current dateComponents   day   month   year                                                                  from  registrationDate                                                                 to  currentDate          print  --------------------- Result    dateDifference year    0  years   dateDifference month    0  months and   dateDifference day    0  days         else           print  --------------------- No result           Output is  Result  10 years 1 months and 18 days

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For XCode Version 8 3 3  amp  Swift 3 0       let dateFormatter   DateFormatter       dateFormatter dateStyle    medium     dateFormatter timeStyle    short      var beginDate    2017-08-24 12 00 00      var endDate    2017-09-07 12 00 00        let startDateTime   dateFormatter date from  beginDate    according to date format your date string     print startDateTime          Convert String to Date      let endDateTime   dateFormatter date from  endDate    according to date format your date string     print endDateTime          Convert String to Date      let dateComponentsFormatter   DateComponentsFormatter       dateComponentsFormatter allowedUnits    NSCalendar Unit minute NSCalendar Unit hour NSCalendar Unit day       let interval   endDateTime  timeIntervalSince startDateTime      var diff   dateComponentsFormatter string from  interval       print diff      var day i    0    var hour i   0    var min i   0        if  diff contains  d                           let day   diff substring to   diff range of   d    lowerBound                    day i    Int day                  print   day -- gt    day i                    diff   diff substring from  diff range of         upperBound                    print diff                    let hour   diff substring to   diff range of         lowerBound            hour i    Int hour          print   hour -- gt    hour i            let min   diff substring from   diff range of         upperBound            min i    Int min          print   min -- gt    min i

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Swift 5 1     iOS 13  You can use RelativeDateFormatter that has been introduced by Apple in iOS 13   let exampleDate   Date   addingTimeInterval -15000   let formatter   RelativeDateTimeFormatter   formatter unitsStyle    full let relativeDate   formatter localizedString for  exampleDate  relativeTo  Date     print relativeDate     4 hours ago   See How to show a relative date and time using RelativeDateTimeFormatter

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func dateDiff dateStr String  - gt  String               var f NSDateFormatter   NSDateFormatter               f timeZone   NSTimeZone localTimeZone               f dateFormat    yyyy-M-dd T HH mm ss SSSZZZ               var now   f stringFromDate NSDate                var startDate   f dateFromString dateStr              var endDate   f dateFromString now              var calendar  NSCalendar   NSCalendar currentCalendar                let calendarUnits   NSCalendarUnit CalendarUnitWeekOfMonth   NSCalendarUnit CalendarUnitDay   NSCalendarUnit CalendarUnitHour   NSCalendarUnit CalendarUnitMinute   NSCalendarUnit CalendarUnitSecond             let dateComponents   calendar components calendarUnits  fromDate  startDate   toDate  endDate   options  nil               let weeks   abs dateComponents weekOfMonth              let days   abs dateComponents day              let hours   abs dateComponents hour              let min   abs dateComponents minute              let sec   abs dateComponents second               var timeAgo                   if  sec  gt  0                   if  sec  gt  1                        timeAgo      sec  Seconds Ago                    else                       timeAgo      sec  Second Ago                                               if  min  gt  0                   if  min  gt  1                        timeAgo      min  Minutes Ago                    else                       timeAgo      min  Minute Ago                                               if hours  gt  0                   if  hours  gt  1                        timeAgo      hours  Hours Ago                    else                       timeAgo      hours  Hour Ago                                               if  days  gt  0                    if  days  gt  1                        timeAgo      days  Days Ago                    else                       timeAgo      days  Day Ago                                               if weeks  gt  0                   if  weeks  gt  1                        timeAgo      weeks  Weeks Ago                    else                       timeAgo      weeks  Week Ago                                               print  timeAgo is    gt    timeAgo                return timeAgo

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combined Extension   DateComponentsFormatter from the answer of  leo-dabus  Xcode 8 3     Swift 3 1  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           let dateComponentsFormatter   DateComponentsFormatter   dateComponentsFormatter difference from  Date    to  Date timeIntervalSinceNow  4000000       1 month

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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         var calendar  NSCalendar   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 DayCalendarUnit let components   calendar components flags  fromDate  date1  toDate  date2  options  nil   components day     This will return the number of day s  between dates

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import Foundation  extension DateComponents        func dateComponentsToTimeString   - gt  String            var hour      self hour            var minute      self minute            var second      self second             if self hour   lt  10   hour    0    hour           if self minute   lt  10   minute    0    minute           if self second   lt  10   second    0    second            let str      hour    minute    second           return str           extension Date        func offset from date  Date - gt  DateComponents           let components   Set lt Calendar Component gt    second   minute   hour   day   month   year           let differenceOfDate   Calendar current dateComponents components  from  date  to  self          return differenceOfDate           Use   var durationString  String           return self endTime offset from  self startTime  dateComponentsToTimeString

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