"iOS Learning note" Swift iOS date operation: NSDate, NSDateFormatter (reprint)

reprinted from: http://blog.csdn.net/jinnchang/article/details/44592801
1. Date (nsdate) [OBJC]View Plaincopy

2. 1. Initialization
4. Initializes an object of the current moment
6. var now = NSDate ()
8. Initializes an object for the current moment of tomorrow
10. var tomorrow = NSDate (timeintervalsincenow: 260*60)
12. Initializes an object of the current moment yesterday
14. var yestoday = nsdate (timeinterval:260*60, sincedate:now) /c2>
16. Initializes a time object for 2001-01-01 08:00:00 1 hours after
18. var date1 = nsdate (timeintervalsincereferencedate: 3600)
20. Initializes a time object for 1970-01-01 08:00:00 1 hours after
22. var date2 = NSDate (timeintervalsince1970: 3600)
26. 2. Get the time description
28. var datedescription = Now. Description
32. 3. Get time interval
34. Get today to tomorrow's time interval
36. var interval1 = tomorrow. Timeintervalsincedate (now)
38. Get today to tomorrow's time interval
40. var interval2 = tomorrow. Timeintervalsincenow
42. Get 2001-01-01 08:00:00 to today's time interval
44. var interval3 = Now. Timeintervalsincereferencedate
46. Get 1970-01-01 08:00:00 to today's time interval
48. var interval5 = Now. timeIntervalSince1970
52. 4, randomly return an impossible to achieve the future time, the past time
54. Date1 = NSDate. Distantfuture () as NSDate
56. Date2 = NSDate. Distantpast () as NSDate
60. 5. Time added
62. Returns an object for the current moment of the day (based on tomorrow plus one day)
64. var thedayaftertomorrow = Tomorrow. Datebyaddingtimeinterval (260*60)
68. 6. Time Comparison
70. Compares two time objects for the same return Boolean value (Isthesamedate is false due to accuracy issues)
72. var isthesamedate = Thedayaftertomorrow. Isequaltodate (NSDate (timeinterval: 260*6 0, sincedate:now))
74. Returns an earlier time in two times
76. var earlierone = Nowearlierdate (tomorrow)
78. Returns a later time in two time
80. var laterone = Nowlaterdate (tomorrow)
82. Compares two time objects for the same and returns a Nscomparisonresult value
84. var compareresult = Nowcompare (Tomorrow)

2. Date conversion (NSDateFormatter) [OBJC]View Plaincopy

2. Method 1: Convert with an existing date format
4. var dateformatter1 = nsdateformatter ()
6. Dateformatter1. Datestyle = Nsdateformatterstyle. Mediumstyle
8. Dateformatter1. Timestyle = Nsdateformatterstyle. Mediumstyle
10. var now = NSDate ()
12. Date Turn String
14. var nowstring = dateformatter1. Stringfromdate (now) //Mar, 9:00:00 PM
16. String to Date
18. now = dateformatter1. datefromstring (nowstring)!
22. Method 2: Custom date format for conversion
24. var dateformatter2 = NSDateFormatter ()
26. Dateformatter2. DateFormat = "Yyyy-mm-dd HH:mm:ss"
28. Date Turn String
30. nowstring = Dateformatter2. Stringfromdate (now) //2015-03-24 21:00:00
32. String to Date
34. now = Dateformatter2. datefromstring (nowstring)!

3. The extension NSDateFormatter provides a way to modify the month, week and other characters, if you are interested, you can refer to the official documents.
A detailed introduction to the Calendar (Nscalendar), date component (nsdatecomponents) is added later.
4. Conclusion

NSDate Class Reference

NSDateFormatter Class Reference

"iOS Learning note" Swift iOS date operation: NSDate, NSDateFormatter (reprint)