How can I calculate the difference between two dates

Question

How can I calculate the days between 1 Jan 2010 and  for example  3 Feb 2010

User · Answer

You may want to use something like this   NSDateComponents  components  NSInteger days   components     NSCalendar currentCalendar  components  NSDayCalendarUnit          fromDate  startDate toDate  endDate options  0   days    components day     I believe this method accounts for situations such as dates that span a change in daylight savings

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NSDate  date1    NSDate dateWithString   2010-01-01 00 00 00  0000    NSDate  date2    NSDate dateWithString   2010-02-03 00 00 00  0000     NSTimeInterval secondsBetween    date2 timeIntervalSinceDate date1    int numberOfDays   secondsBetween   86400   NSLog   There are  d days in between the two dates    numberOfDays     EDIT   Remember  NSDate objects represent exact moments of time  they do not have any associated time-zone information  When you convert a string to a date using e g  an NSDateFormatter  the NSDateFormatter converts the time from the configured timezone  Therefore  the number of seconds between two NSDate objects will always be time-zone-agnostic   Furthermore  this documentation specifies that Cocoa s implementation of time does not account for leap seconds  so if you require such accuracy  you will need to roll your own implementation

User · Answer

With Swift 5 and iOS 12  according to your needs  you may use one of the two following ways to find the difference between two dates in days    1  Using Calendar s dateComponents   from to   method import Foundation  let calendar   Calendar current  let startDate   calendar date from  DateComponents year  2010  month  11  day  22    let endDate   calendar date from  DateComponents year  2015  month  5  day  1     let dateComponents   calendar dateComponents  Calendar Component day   from  startDate  to  endDate   print dateComponents     prints  day  1621 isLeapMonth  false print String describing  dateComponents day      prints  Optional 1621     2  Using DateComponentsFormatter s string from to   method import Foundation  let calendar   Calendar current  let startDate   calendar date from  DateComponents year  2010  month  11  day  22    let endDate   calendar date from  DateComponents year  2015  month  5  day  1     let formatter   DateComponentsFormatter   formatter unitsStyle    full formatter allowedUnits    NSCalendar Unit day   let elapsedTime   formatter string from  startDate  to  endDate  print String describing  elapsedTime      prints  Optional  quot 1 621 days quot

User · Answer

You can find the difference by converting the date in seconds and take time interval since 1970 for this and then you can find the difference between two dates

User · Answer

Checkout this out  It takes care of daylight saving   leap year as it used iOS calendar to calculate You can change the string and conditions to includes minutes with hours and days     NSString  remaningTime  NSDate  startDate endDate  NSDate  endDate       NSDateComponents  components      NSInteger days      NSInteger hour      NSInteger minutes      NSString  durationString       components     NSCalendar currentCalendar  components  NSCalendarUnitDay NSCalendarUnitHour NSCalendarUnitMinute fromDate  startDate toDate  endDate options  0        days    components day       hour    components hour       minutes    components minute        if days gt 0                if days gt 1              durationString  NSString stringWithFormat    d days  days           else             durationString  NSString stringWithFormat    d day  days           return durationString            if hour gt 0                        if hour gt 1              durationString  NSString stringWithFormat    d hours  hour           else             durationString  NSString stringWithFormat    d hour  hour           return durationString            if minutes gt 0                if minutes gt 1              durationString    NSString stringWithFormat    d minutes  minutes           else             durationString    NSString stringWithFormat    d minute  minutes            return durationString            return

User · Answer

Swift 4 Try this and see  date range with String       Start  amp  End date string let startingAt    01 01 2018  let endingAt    08 03 2018      Sample date formatter let dateFormatter   DateFormatter   dateFormatter dateFormat    dd MM yyyy      start and end date object from string dates var startDate   dateFormatter date from  startingAt     Date   let endDate   dateFormatter date from  endingAt     Date        Actual operational logic var dateRange   String       while startDate  lt   endDate       let stringDate   dateFormatter string from  startDate      startDate   Calendar current date byAdding   day  value  1  to  startDate     Date       dateRange append stringDate     print  Resulting Array -   dateRange      Swift 3  var date1   Date string   2010-01-01 00 00 00  0000   var date2   Date string   2010-02-03 00 00 00  0000   var secondsBetween  TimeInterval   date2 timeIntervalSince date1  var numberOfDays  Int   secondsBetween   86400 print numberOfDays

User · Answer

If you want all the units  not just the biggest one  use one of these 2 methods  based on  Ankish s answer   Example output  28 D   23 H   59 M   59 S    NSString    remaningTime  NSDate   startDate endDate  NSDate   endDate       NSCalendarUnit units   NSCalendarUnitDay   NSCalendarUnitHour   NSCalendarUnitMinute   NSCalendarUnitSecond      NSDateComponents  components     NSCalendar currentCalendar  components units fromDate  startDate toDate  endDate options  0       return  NSString stringWithFormat   quot  ti D    ti H    ti M    ti S quot    components day    components hour    components minute    components second          NSString    timeFromNowUntil  NSDate   endDate       return  self remaningTime  NSDate date  endDate endDate

User · Answer

NSTimeInterval diff    date2 timeIntervalSinceDate date1      in seconds   where date1 and date2 are NSDate s   Also  note the definition of NSTimeInterval   typedef double NSTimeInterval

User · Answer

To find the difference  you need to get the current date and the date in the future  In the following case  I used 2 days for an example of the future date  Calculated by   2 days   24 hours   60 minutes   60 seconds  We expect the number of seconds in 2 days to be 172 800      Set the current and future date let now   Date   let nowPlus2Days   Date timeInterval  2 24 60 60  since  now      Get the number of seconds between these two dates let secondsInterval   DateInterval start  now  end  nowPlus2Days  duration  print secondsInterval     172800 0

[objective-c] How can I calculate the difference between two dates?

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