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I'm wondering if there is some new and awesome possibility to get the amount of days between two NSDates in Swift / the "new" Cocoa?
E.g. like in Ruby I would do:
(end_date - start_date).to_i 
247
Getting difference between two dates is easy. You should know how to play between the dates. We will be using DateFormatter class for formatting the dates. Instances of DateFormatter create string representations of NSDate objects, and convert textual representations of dates and times into NSDate objects.
To subtract hours from a date in swift we need to create a date first. Once that date is created we have to subtract hours from that, though swift does not provide a way to subtract date or time, but it provides us a way to add date or date component in negative value.
You can use the following method to get any date by adding days or months or years by specifying the Calendar Component and the increment value of this component: func getSpecificDate(byAdding component: Calendar. Component, value: Int) -> Date { let noon = Calendar. current.
You have to consider the time difference as well. For example if you compare the dates 2015-01-01 10:00 and 2015-01-02 09:00, days between those dates will return as 0 (zero) since the difference between those dates is less than 24 hours (it's 23 hours).
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 // ... let calendar = 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.Day let components = calendar.components(flags, fromDate: date1, toDate: date2, options: []) components.day // This will return the number of day(s) between dates let calendar = Calendar.current // Replace the hour (time) of both dates with 00:00 let date1 = calendar.startOfDay(for: firstDate) let date2 = calendar.startOfDay(for: secondDate) let components = calendar.dateComponents([.day], from: date1, to: date2) If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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