How to convert NSDate into unix timestamp iphone sdk

Question

How to convert an NSDate into Unix timestamp  I ve read many posts which do the reverse  But I m not finding anything related to my question

User · Answer

If you need time stamp as a string   time t result   time NULL                   NSString  timeStampString      result  stringValue

User · Answer

If you want to store these time in a database or send it over the server   best is to use Unix timestamps  Here s a little snippet to get that      NSTimeInterval getUTCFormateDate       NSDateComponents  comps     NSCalendar currentCalendar                                  components NSDayCalendarUnit   NSYearCalendarUnit   NSMonthCalendarUnit                                 fromDate  NSDate date         comps setHour 0        comps setMinute 0            comps setSecond   NSTimeZone systemTimeZone  secondsFromGMT         return    NSCalendar currentCalendar  dateFromComponents comps  timeIntervalSince1970

User · Answer

A Unix timestamp is the number of seconds since 00 00 00 UTC January 1  1970   It s represented by the type time t  which is usually a signed 32-bit integer type  long or int    iOS provides - NSTimeInterval timeIntervalSince1970 for NSDate objects which returns the number of seconds since 00 00 00 GMT January 1  1970   NSTimeInterval is a double floating point type so you get the seconds and fractions of a second   Since they both have the same reference  midnight 1Jan1970 UTC  and are both in seconds the conversion is easy  convert the NSTimeInterval to a time t  rounding or truncating depending on your needs   time t unixTime    time t    NSDate date  timeIntervalSince1970

User · Answer

Swift Updated for Swift 3    current date and time let someDate   Date       time interval since 1970 let myTimeStamp   someDate timeIntervalSince1970  Notes  timeIntervalSince1970 returns TimeInterval  which is a typealias for Double   If you wanted to go the other way you could do the following    let myDate   Date timeIntervalSince1970  myTimeStamp

User · Answer

I believe this is the NSDate s selector you re looking for   -  NSTimeInterval timeIntervalSince1970

User · Answer

My preferred way is simply   NSDate date timeIntervalSince1970

User · Answer

-  void GetCurrentTimeStamp               NSDateFormatter  objDateformat     NSDateFormatter alloc  init            objDateformat setDateFormat   yyyy-MM-dd            NSString     strTime    objDateformat stringFromDate  NSDate date            NSString     strUTCTime    self GetUTCDateTimeFromLocalTime strTime    You can pass your date but be carefull about your date format of NSDateFormatter          NSDate  objUTCDate     objDateformat dateFromString strUTCTime           long long milliseconds    long long   objUTCDate timeIntervalSince1970    1000 0            NSString  strTimeStamp    Nsstring stringwithformat    lld  milliseconds           NSLog   The Timestamp is       strTimestamp           -  NSString    GetUTCDateTimeFromLocalTime  NSString   IN strLocalTime               NSDateFormatter  dateFormatter     NSDateFormatter alloc  init            dateFormatter setDateFormat   yyyy-MM-dd            NSDate   objDate       dateFormatter dateFromString IN strLocalTime            dateFormatter setTimeZone  NSTimeZone timeZoneWithAbbreviation   UTC             NSString  strDateTime      dateFormatter stringFromDate objDate           return strDateTime          NOTE  - The Timestamp must be in UTC Zone  So I convert our local Time to UTC Time

User · Answer

NSString stringWithFormat    first unixtime is  ld  message  long   NSDate date  timeIntervalSince1970       NSString stringWithFormat    second unixtime is  ld  message   NSDate date  timeIntervalSince1970       NSString stringWithFormat    third unixtime is   0f  message   NSDate date  timeIntervalSince1970       first unixtime 1532278070  second unixtime 1532278070 461380  third unixtime 1532278070

User · Answer

As per  kexik s suggestion using the UNIX time function as below       time t result   time NULL     NSLog  NSString stringWithFormat   The current Unix epoch time is  d   int result       As per my experience - don t use timeIntervalSince1970   it gives epoch timestamp - number of seconds you are behind GMT   There used to be a bug with   NSDate date timeIntervalSince1970    it used to add subtract time based on the timezone of the phone but it seems to be resolved now

User · Answer

You can create a unix timestamp date from a date this way   NSTimeInterval timestamp     NSDate date  timeIntervalSince1970

[ios] How to convert NSDate into unix timestamp iphone sdk?

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