iOS Compare two dates

Question

I have a NSDate that I must compare with other two NSDate and I try with NSOrderAscending and NSOrderDescending but if my date is equal at other two dates   Example  if I have a myDate   24 05 2011   and other two that are one   24 05 2011 and two 24 05 2011 what can I use

User · Accepted Answer

According to Apple documentation of NSDate compare      Returns an NSComparisonResult value that indicates the temporal ordering of the receiver and another given date       -  NSComparisonResult compare  NSDate   anotherDate      Parameters anotherDate      The date with which to compare the   receiver  This value must not be nil    If the value is nil  the behavior is   undefined and may change in future   versions of Mac OS X       Return Value      If       The receiver and anotherDate are   exactly equal to each other    NSOrderedSame      The receiver is later in   time than anotherDate    NSOrderedDescending      The receiver is   earlier in time than anotherDate    NSOrderedAscending   In other words   if   date1 compare date2     NSOrderedSame        Note that it might be easier in your particular case to read and write this    if   date2 isEqualToDate date2         See Apple Documentation about this one

User · Answer

Check the following Function for date comparison first of all create two NSDate objects and pass to the function   Add the bellow lines of code in viewDidload or according to your scenario   - void testDateComaparFunc   NSString  getTokon Time1     2016-05-31 03 19 05  0000   NSString  getTokon Time2     2016-05-31 03 18 05  0000   NSDateFormatter  dateFormatter  NSDateFormatter new    dateFormatter setDateFormat   yyyy-MM-dd hh mm ss Z    NSDate  tokonExpireDate1  dateFormatter dateFromString getTokon Time1   NSDate  tokonExpireDate2  dateFormatter dateFromString getTokon Time2   BOOL isTokonValid    self dateComparision tokonExpireDate1 andDate2 tokonExpireDate2      here is the function   - BOOL dateComparision  NSDate  date1 andDate2  NSDate  date2   BOOL isTokonValid   if   date1 compare date2     NSOrderedDescending           date1 is later than date2     isTokonValid   YES    else if   date1 compare date2     NSOrderedAscending          date1 is earlier than date2     isTokonValid   NO    else        dates are the same     isTokonValid   NO      return isTokonValid     Simply change the date and test above function

User · Answer

I take it you are asking what the return value is in the comparison function   If the dates are equal then returning NSOrderedSame  If ascending   2nd arg   1st arg   return NSOrderedAscending   If descending   2nd arg  lt  1st arg   return NSOrderedDescending

User · Answer

I don t know exactly if you have asked this but if you only want to compare the date component of a NSDate you have to use NSCalendar and NSDateComponents to remove the time component    Something like this should work as a category for NSDate   -  NSComparisonResult compareDateOnly  NSDate   otherDate       NSUInteger dateFlags   NSYearCalendarUnit NSMonthCalendarUnit NSDayCalendarUnit      NSCalendar  gregorianCalendar      NSCalendar alloc  initWithCalendarIdentifier NSGregorianCalendar  autorelease       NSDateComponents  selfComponents    gregorianCalendar components dateFlags fromDate self       NSDate  selfDateOnly    gregorianCalendar dateFromComponents selfComponents        NSDateComponents  otherCompents    gregorianCalendar components dateFlags fromDate otherDate       NSDate  otherDateOnly    gregorianCalendar dateFromComponents otherCompents       return  selfDateOnly compare otherDateOnly

User · Answer

After searching stackoverflow and the web a lot  I ve got to conclution that the best way of doing it is like this   -  BOOL isEndDateIsSmallerThanCurrent  NSDate   checkEndDate       NSDate  enddate   checkEndDate      NSDate  currentdate    NSDate date       NSTimeInterval distanceBetweenDates    enddate timeIntervalSinceDate currentdate       double secondsInMinute   60      NSInteger secondsBetweenDates   distanceBetweenDates   secondsInMinute       if  secondsBetweenDates    0          return YES      else if  secondsBetweenDates  lt  0          return YES      else         return NO      You can change it to difference between hours also   Enjoy     Edit 1  If you want to compare date with format of dd MM yyyy only  you need to add below lines between NSDate  currentdate    NSDate date    amp  amp  NSTimeInterval distance  NSDateFormatter  dateFormatter     NSDateFormatter alloc  init    dateFormatter setDateFormat   dd MM yyyy     dateFormatter setLocale    NSLocale alloc  initWithLocaleIdentifier   en US                             autorelease     NSString  stringDate    dateFormatter stringFromDate  NSDate date     currentdate    dateFormatter dateFromString stringDate

User · Answer

NSDate actually represents a time interval in seconds since a reference date  1st Jan 2000 UTC I think    Internally  a double precision floating point number is used so two arbitrary dates are highly unlikely to compare equal even if they are on the same day   If you want to see if a particular date falls on a particular day  you probably need to use NSDateComponents  e g    NSDateComponents  dateComponents     NSDateComponents alloc  init    dateComponents setYear  2011    dateComponents setMonth  5    dateComponents setDay  24          Construct two dates that bracket the day you are checking        Use the user s current calendar   I think this takes care of things like daylight saving time      NSCalendar  calendar    NSCalendar currentCalendar   NSDate  startOfDate    calendar dateFromComponents  dateComponents   NSDateComponents  oneDay     NSDateComponents alloc  init    oneDay setDay  1   NSDate  endOfDate    calendar dateByAddingComponents  oneDay toDate  startOfDate options  0          Compare the date with the start of the day and the end of the day      NSComparisonResult startCompare    startOfDate compare  myDate   NSComparisonResult endCompare    endOfDate compare  myDate    if  startCompare    NSOrderedDescending  amp  amp  endCompare    NSOrderedDescending           we are on the right date

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