Swift 3 - Comparing Date objects

Question

I m updating my app to Swift 3 0 syntax  I know it s still in beta but I want to be prepared as soon as it released   Until the previous Beta of Xcode  Beta 5  I was able to compare two Date objects using the operands  lt    gt  and     But in the latest beta  Beta 6  this isn t working any more  Here are some screenshots    As you can see in both screenshots  these are two Date objects  But I get the following error   What am I doing wrong  The functions are still declared in the Date class   static func  gt  Date  Date   Returns true if the left hand Date is later in time than the right hand Date    Is this just a Beta bug or am I doing something wrong

User · Answer

As of the time of this writing  Swift natively supports comparing Dates with all comparison operators  i e   lt    lt         gt    and  gt    You can also compare optional Dates but are limited to  lt       and  gt   If you need to compare two optional dates using  lt   or  gt    i e   let date1  Date        let date2  Date        if date1  gt   date2           You can overload the  lt   and  gt  operators to support optionals   func  lt    lt T  Comparable gt  lhs  T   rhs  T   - gt  Bool       return lhs    rhs    lhs  lt  rhs    func  gt    lt T  Comparable gt  lhs  T   rhs  T   - gt  Bool       return lhs    rhs    lhs  gt  rhs

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If you want to ignore seconds for example   you can use   func isDate Date  equalTo  Date  toUnitGranularity  NSCalendar Unit  -  Bool  Example compare if it s the same day   Calendar current isDate date1  equalTo  date2  toGranularity   day

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Another way to do it       switch date1 compare date2            case  orderedAscending              break          case  orderedDescending              break           case  orderedSame              break

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Look this http   iswift org cookbook compare-2-dates  Get Dates       Get current date let dateA   NSDate       Get a later date  after a couple of milliseconds  let dateB   NSDate     Using SWITCH Statement     Compare them switch dateA compare dateB        case  OrderedAscending         print  Date A is earlier than date B       case  OrderedDescending        print  Date A is later than date B       case  OrderedSame              print  The two dates are the same       using IF Statement   if dateA compare dateB      orderedAscending        datePickerTo date   datePicker date        OR   if case  orderedAcending   dateA compare dateB

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in Swift 3 4 you should use  Compare   for example   DateArray sort      0   compare  1        orderedDescending

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Swift 5   1  If you use Date type   let firstDate    Date   let secondDate   Date    print firstDate  gt  secondDate    print firstDate  lt  secondDate  print firstDate    secondDate    2  If you use String type   let firstStringDate     2019-05-22T09 56 00 1111111  let secondStringDate    2019-05-22T09 56 00 2222222   print firstStringDate  gt  secondStringDate      false print firstStringDate  lt  secondStringDate      true print firstStringDate    secondStringDate     false    I m not sure or the second option works at 100   But how much would I not change the values of firstStringDate and secondStringDate the result was correct

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SWIFT 3  Don t know if this is what you re looking for  But I compare a string to a current timestamp to see if my string is older that now   func checkTimeStamp date  String   - gt  Bool           let dateFormatter  DateFormatter   DateFormatter           dateFormatter dateFormat    yyyy-MM-dd HH mm ss          dateFormatter locale   Locale identifier  en US POSIX           let datecomponents   dateFormatter date from  date           let now   Date            if  datecomponents   gt   now                return true           else               return false                   To use it    if  checkTimeStamp date  2016-11-21 12 00 00      false           Do something

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Date is Comparable  amp  Equatable  as of Swift 3   This answer complements  Ankit Thakur s answer   Since Swift 3 the Date struct  based on the underlying NSDate class  adopts the Comparable and Equatable protocols    Comparable requires that Date implement the operators   lt    lt     gt    gt    Equatable requires that Date implement the    operator  Equatable allows Date to use the default implementation of the    operator  which is the inverse of the Equatable    operator implementation     The following sample code exercises these comparison operators and confirms which comparisons are true with print statements   Comparison function  import Foundation  func describeComparison date1  Date  date2  Date  - gt  String        var descriptionArray   String            if date1  lt  date2           descriptionArray append  date1  lt  date2              if date1  lt   date2           descriptionArray append  date1  lt   date2              if date1  gt  date2           descriptionArray append  date1  gt  date2              if date1  gt   date2           descriptionArray append  date1  gt   date2              if date1    date2           descriptionArray append  date1    date2              if date1    date2           descriptionArray append  date1    date2              return descriptionArray joined separator             Sample Use  let now   Date    describeComparison date1  now  date2  now addingTimeInterval 1      date1  lt  date2   date1  lt   date2   date1    date2  describeComparison date1  now  date2  now addingTimeInterval -1      date1  gt  date2   date1  gt   date2   date1    date2  describeComparison date1  now  date2  now     date1  lt   date2   date1  gt   date2   date1    date2

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var strDateValidate                  let dateFormatter   DateFormatter               dateFormatter dateFormat    yyyy-MM-dd               let firstDate   dateFormatter date from lblStartTime text               let secondDate   dateFormatter date from lblEndTime text                if firstDate  compare secondDate       orderedSame    firstDate  compare secondDate       orderedAscending                   print  Both dates are same or first is less than scecond                   strDateValidate    yes                            else                                 second date is bigger than first                 strDateValidate    no                             if strDateValidate     no                                alertView message   Start date and end date for a booking must be equal or Start date must be smaller than the end date   controller  self

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from Swift 3 and above  Date is Comparable so we can directly compare dates like let date1   Date   let date2   Date   addingTimeInterval 50   let isGreater   date1  gt  date2 print isGreater   let isSmaller   date1  lt  date2 print isSmaller   let isEqual   date1    date2 print isEqual   Alternatively We can create extension on Date extension Date      func isEqualTo   date  Date  - gt  Bool       return self    date          func isGreaterThan   date  Date  - gt  Bool        return self  gt  date          func isSmallerThan   date  Date  - gt  Bool        return self  lt  date        Use  let isEqual   date1 isEqualTo date2

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extension Date    func isBetween   date1  Date  and date2  Date  - gt  Bool       return  min date1  date2      max date1  date2   contains self         let resultArray   dateArray filter    0 dateObj  isBetween startDate  and  endDate

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To compare date only with year - month - day and without time for me worked like this        let order   Calendar current compare self startDate  to  compareDate   toGranularity   day                           switch order                           case  orderedAscending                              print    gpsDate  is after   self startDate                            case  orderedDescending                              print    gpsDate  is before   self startDate                            default                              print    gpsDate  is the same as   self startDate

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I have tried this snippet  in Xcode 8 Beta 6   and it is working fine  let date1   Date   let date2   Date   addingTimeInterval 100   if date1    date2         else if date1  gt  date2         else if date1  lt  date2

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For me the problem was that I had my own extension to Date class that was defining all the compare operators  Now  since swift 3  that Date is comparable  these extensions are not needed  So I commented them out and it worked

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