How to convert an NSTimeInterval seconds into minutes

Question

I ve got an amount of seconds that passed from a certain event  It s stored in a NSTimeInterval data type   I want to convert it into minutes and seconds   For example I have   326 4  seconds and I want to convert it into the following string   5 26    What is the best way to achieve this goal   Thanks

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Here s a Swift version   func durationsBySecond seconds s  Int  - gt   days Int hours Int minutes Int seconds Int        return  s    24   3600   s    24   3600     3600  s   3600   60  s   60      Can be used like this   let  d h m s    durationsBySecond seconds  duration  println  time left    d  days   h  hours   m  minutes   s  seconds

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If you re targeting at or above iOS 8 or OS X 10 10  this just got a lot easier  The new NSDateComponentsFormatter class allows you to convert a given NSTimeInterval from its value in seconds to a localized string to show the user  For example   Objective-C  NSTimeInterval interval   326 4   NSDateComponentsFormatter  componentFormatter     NSDateComponentsFormatter alloc  init    componentFormatter unitsStyle   NSDateComponentsFormatterUnitsStylePositional  componentFormatter zeroFormattingBehavior   NSDateComponentsFormatterZeroFormattingBehaviorDropAll   NSString  formattedString    componentFormatter stringFromTimeInterval interval   NSLog       formattedString      5 26   Swift  let interval   326 4  let componentFormatter   NSDateComponentsFormatter    componentFormatter unitsStyle    Positional componentFormatter zeroFormattingBehavior    DropAll  if let formattedString   componentFormatter stringFromTimeInterval interval        print formattedString     5 26     NSDateCompnentsFormatter also allows for this output to be in longer forms  More info can be found in NSHipster s NSFormatter article  And depending on what classes you re already working with  if not NSTimeInterval   it may be more convenient to pass the formatter an instance of NSDateComponents  or two NSDate objects  which can be done as well via the following methods   Objective-C  NSString  formattedString    componentFormatter stringFromDate  lt   NSDate     gt  toDate  lt   NSDate     gt    NSString  formattedString    componentFormatter stringFromDateComponents  lt   NSDateComponents     gt      Swift  if let formattedString   componentFormatter stringFromDate  lt  T  startDate  NSDate  NSDate  gt   toDate   lt  T  NSDate  gt                   if let formattedString   componentFormatter stringFromDateComponents  lt  T  components  NSDateComponents  NSDateComponents  gt

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All of these look more complicated than they need to be  Here is a short and sweet way to convert a time interval into hours  minutes and seconds   NSTimeInterval timeInterval   326 4  long seconds   lroundf timeInterval      Since modulo operator     below needs int or long  int hour   seconds   3600  int mins    seconds   3600    60  int secs   seconds   60    Note when you put a float into an int  you get floor   automatically  but you can add it to the first two if if makes you feel better  -

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How I did this in Swift  including the string formatting to show it as  01 23     let totalSeconds  Double   someTimeInterval let minutes   Int floor totalSeconds   60   let seconds   Int round totalSeconds   60           let timeString   String format    02d  02d   minutes  seconds  NSLog timeString

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Brief Description   The answer from Brian Ramsay is more convenient if you only want to convert to minutes  If you want Cocoa API do it for you and convert your NSTimeInterval not only to minutes but also to days  months  week  etc     I think this is a more generic approach Use NSCalendar method     NSDateComponents   components  NSUInteger unitFlags fromDate  NSDate   startingDate toDate  NSDate   resultDate options  NSUInteger opts  Returns  as an NSDateComponents object using specified components  the difference between two supplied dates   From the API documentation    Create 2 NSDate whose difference is the NSTimeInterval you want to convert   If your NSTimeInterval comes from comparing 2 NSDate you don t need to do this step  and you don t even need the NSTimeInterval   Get your quotes from NSDateComponents   Sample Code     The time interval  NSTimeInterval theTimeInterval   326 4      Get the system calendar NSCalendar  sysCalendar    NSCalendar currentCalendar       Create the NSDates NSDate  date1     NSDate alloc  init   NSDate  date2     NSDate alloc  initWithTimeInterval theTimeInterval sinceDate date1        Get conversion to months  days  hours  minutes unsigned int unitFlags   NSHourCalendarUnit   NSMinuteCalendarUnit   NSDayCalendarUnit   NSMonthCalendarUnit   NSDateComponents  conversionInfo    sysCalendar components unitFlags fromDate date1  toDate date2  options 0    NSLog   Conversion   dmin  dhours  ddays  dmoths   conversionInfo minute    conversionInfo hour    conversionInfo day    conversionInfo month      date1 release    date2 release     Known issues   Too much for just a conversion  you are right  but that s how the API works  My suggestion  if you get used to manage your time data using NSDate and NSCalendar  the API will do the hard work for you

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Remember that the original question is about a string output  not pseudo-code or individual string components   I want to convert it into the following string   quot 5 26 quot   Many answers are missing the internationalization issues  and most doing the math computations by hand  All just so 20th century    Do not do the Math yourself  Swift 4  let timeInterval  TimeInterval   326 4 let dateComponentsFormatter   DateComponentsFormatter   dateComponentsFormatter unitsStyle    positional if let formatted   dateComponentsFormatter string from  timeInterval        print formatted      5 26   Leverage on libraries If you really want individual components  and pleasantly readable code  check out SwiftDate  import SwiftDate     if let minutes   Int timeInterval  seconds in  minute        print  quot   minutes  quot       5   Credits to  mickmaccallum and  polarwar for adequate usage of DateComponentsFormatter

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Brian Ramsay   s code  de-pseudofied   -  NSString  formattedStringForDuration  NSTimeInterval duration       NSInteger minutes   floor duration 60       NSInteger seconds   round duration - minutes   60       return  NSString stringWithFormat    d  02d   minutes  seconds

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Swift 2 version         extension NSTimeInterval               func toMM SS   - gt  String                   let interval   self                 let componentFormatter   NSDateComponentsFormatter                    componentFormatter unitsStyle    Positional                 componentFormatter zeroFormattingBehavior    Pad                 componentFormatter allowedUnits     Minute   Second                  return componentFormatter stringFromTimeInterval interval                                    let duration   326 4 toMM SS       print duration        5 26

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NSDate  timeLater    NSDate dateWithTimeIntervalSinceNow 60 90        NSTimeInterval duration    timeLater  timeIntervalSinceNow        NSInteger hours   floor duration  60 60        NSInteger minutes   floor  duration 60  - hours   60       NSInteger seconds   floor duration -  minutes   60  -  hours   60   60         NSLog   timeLater        dateFormatter stringFromDate timeLater         NSLog   time left   d hours  d minutes   d seconds   hours minutes seconds     Outputs    timeLater  22 27 timeLeft  1 hours 29 minutes  59 seconds

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Since it s essentially a double     Divide by 60 0 and extract the integral part and the fractional part   The integral part will be the whole number of minutes   Multiply the fractional part by 60 0 again   The result will be the remaining seconds

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pseudo-code   minutes   floor 326 4 60  seconds   round 326 4 - minutes   60

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Forgive me for being a Stack virgin    I m not sure how to reply to Brian Ramsay s answer     Using round will not work for second values between 59 5 and 59 99999   The second value will be 60 during this period   Use trunc instead      double progress    int minutes   floor progress 60    int seconds   trunc progress - minutes   60

[objective-c] How to convert an NSTimeInterval (seconds) into minutes

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