#Playing with Swift Date

This project is aimed to show the basic use of Swift Date class. The contents are an implementation of AppCoda's tutorial. See http://www.appcoda.com/nsdate/ for details.

All the codes are tested on XCode 7.2 Swift 2.1.1 playground.

The prject contains the uses of following classes or enums or structs:

• NSDate
• NSDateFormatter
• NSCalendar
• NSDateComponents
• NSDateComponentsFormatter
• NSComparisonResult enum
• NSCalendarUnit struct

I'm an open source project beginner and very interest in the open source community. I hope I can be one of them and am pretty likely to communicate with anyone who are already one of them. Please, please contact me if you have any suggestion. My Email: [email protected] :)

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##Part I : Using NSDate and NSDateFormatter

• Create a NSDate object
• Create a NSDateFormatter object
• Use dateStyle property for NSDateFormatter to show predefined date format
• Given an NSLocale object to locale property of NSDateFormatter to show locale-related date format.
  • I use China locale in this example because I'm a Chinese:)
• Given an date specifier string to dateFormat property of NSDateFormatter to show custom date format
• Use NSDateFormatter's dateFromString: method to convert a date string to an NSDate object

##PART II : Using NSDateComponents

• Create an NSCalendar object
• Convert an NSDate object into an NSDateComponents object using NSCalendar's components:fromDate method
• Convert an NSDateComponents object back to an NSDate object using NSCalendar's dateFromComponents: method
• See results of one date from different time zones by setting NSDataComponents' timezone property

##PART III : Comparing Date and Time

• Compare two dates by NSDate's earlierDate: and laterDate: methods
• Compare two dates by compare: function and NSComparisonResult enum
• Compare two dates by using NSDate's timeIntervalSinceReferenceDate property
• Use isEqualToDate: to see if two NSDates' objects are equal

##PART IV : Calculating Future and Past Dates

• Make use the NSCalendar class and NSCalendarUnit struct
• Make use the NSDateComponents object
• Use NSDate's dateByAddingTimeInterval: method
  • This method may produce wrong results because of leap seconds, leap years, daylight saving time, and so on
• Substract a number of days from an NSDate object

##PART V : Calculating Date Difference

• Using the NSCalendar's components:fromDate:toDate:options: method
• Using NSDateComponentsFormatter's stringFromTimeInterval method
• Using NSDateComponentsFormatter's stringFromDate:toDate method