iPhone How to get current milliseconds

Question

What is the best way to get the current system time milliseconds

User · Accepted Answer

NSDate date  timeIntervalSince1970     It returns the number of seconds since epoch as a double  I m almost sure you can access the milliseconds from the fractional part

User · Answer

So far I found gettimeofday a good solution on iOS  iPad   when you want to perform some interval evaluation  say  framerate  timing of a rendering frame         include  lt sys time h gt  struct timeval time  gettimeofday  amp time  NULL   long millis    time tv sec   1000     time tv usec   1000

User · Answer

It may be useful to know about CodeTimestamps  which provide a wrapper around mach-based timing functions   This gives you nanosecond-resolution timing data - 1000000x more precise than milliseconds   Yes  a million times more precise    The prefixes are milli  micro  nano  each 1000x more precise than the last    Even if you don t need CodeTimestamps  check out the code  it s open source  to see how they use mach to get the timing data   This would be useful when you need more precision and want a faster method call than the NSDate approach   http   eng pulse me line-by-line-speed-analysis-for-ios-apps

User · Answer

I benchmarked all the other answers on an iPhone 4S and iPad 3  release builds   CACurrentMediaTime has the least overhead by a small margin  timeIntervalSince1970 is far slower than the others  probably due to NSDate instantiation overhead  though it may not matter for many use cases   I d recommend CACurrentMediaTime if you want the least overhead and don t mind adding the Quartz Framework dependency  Or gettimeofday if portability is a priority for you   iPhone 4S  CACurrentMediaTime  1 33   s call gettimeofday  1 38   s call  NSDate timeIntervalSinceReferenceDate   1 45   s call CFAbsoluteTimeGetCurrent  1 48   s call   NSDate date  timeIntervalSince1970   4 93   s call   iPad 3  CACurrentMediaTime  1 25   s call gettimeofday  1 33   s call CFAbsoluteTimeGetCurrent  1 34   s call  NSDate timeIntervalSinceReferenceDate   1 37   s call   NSDate date  timeIntervalSince1970   3 47   s call

User · Answer

CFAbsoluteTimeGetCurrent    Absolute time is measured in seconds relative to the absolute reference date of Jan 1 2001 00 00 00 GMT  A positive value represents a date after the reference date  a negative value represents a date before it  For example  the absolute time -32940326 is equivalent to December 16th  1999 at 17 54 34  Repeated calls to this function do not guarantee monotonically increasing results  The system time may decrease due to synchronization with external time references or due to an explicit user change of the clock

User · Answer

Try this    NSDate   timestamp    NSDate dateWithTimeIntervalSince1970   NSDate date  timeIntervalSince1970     NSDateFormatter  dateFormatter     NSDateFormatter alloc  init    dateFormatter setDateFormat   YYYY-MM-dd HH mm ss SSS     NSString  newDateString    dateFormatter stringFromDate timestamp   timestamp    NSDate  newDateString    In this example  dateWithTimeIntervalSince1970 is used in combination of the formatter   YYYY-MM-dd HH mm ss SSS  that will return the date with year  month  day and the time with hours  minutes  seconds  and milliseconds  See the example    2015-12-02 04 43 15 008   I used the NSString to be sure that the format will be has written before

User · Answer

let timeInMiliSecDate   Date   let timeInMiliSec   Int  timeInMiliSecDate timeIntervalSince1970   1000  print timeInMiliSec

User · Answer

Swift 2  let seconds   NSDate   timeIntervalSince1970 let milliseconds   seconds   1000 0   Swift 3  let currentTimeInMiliseconds   Date   timeIntervalSince1970 milliseconds

User · Answer

This is what I used for Swift  var date   NSDate   let currentTime   Int64 date timeIntervalSince1970   1000   print  Time in milliseconds is   currentTime      used this site to verify accuracy http   currentmillis com

User · Answer

NSDate timeIntervalSinceReferenceDate  is another option  if you don t want to include the Quartz framework  It returns a double  representing seconds

User · Answer

Timestamp after converting to milliseconds   NSString   timeInMS    NSString stringWithFormat    lld      floor  date timeIntervalSince1970    1000   longLongValue

User · Answer

In Swift we can make a function and do as follows  func getCurrentMillis  - gt Int64      return  Int64 NSDate   timeIntervalSince1970   1000     var currentTime   getCurrentMillis     Though its working fine in Swift 3 0 but we can modify and use the Date class instead of NSDate in 3 0   Swift 3 0  func getCurrentMillis  - gt Int64       return Int64 Date   timeIntervalSince1970   1000     var currentTime   getCurrentMillis

User · Answer

If you re looking at using this for relative timing  for example for games or animation  I d rather use CACurrentMediaTime    double CurrentTime   CACurrentMediaTime      Which is the recommended way  NSDate draws from the networked synch-clock and will occasionally hiccup when re-synching it against the network   It returns the current absolute time  in seconds     If you want only the decimal part  often used when syncing animations    let ct   CACurrentMediaTime   truncatingRemainder dividingBy  1

User · Answer

NSTimeInterval time      NSDate date  timeIntervalSince1970      double long digits    long time    first 10 digits         int decimalDigits    int  fmod time  1    1000     3 missing digits      long      long timestamp    digits   1000    decimalDigits       string      NSString  timestampString    NSString stringWithFormat    ld 03d  digits  decimalDigits

User · Answer

func currentmicrotimeTimeMillis   - gt  Int64  let nowDoublevaluseis   NSDate   timeIntervalSince1970 return Int64 nowDoublevaluseis 1000

User · Answer

I needed a NSNumber object containing the exact result of   NSDate date  timeIntervalSince1970   Since this function was called many times and I didn t really need to create an NSDate object  performance was not great   So to get the format that the original function was giving me  try this    include  lt sys time h gt  struct timeval tv  gettimeofday  amp tv NULL   double perciseTimeStamp   tv tv sec   tv tv usec   0 000001    Which should give you the exact same result as   NSDate date  timeIntervalSince1970

User · Answer

NSTimeInterval time      NSDate date  timeIntervalSince1970      double long digits    long time    first 10 digits         int decimalDigits    int  fmod time  1    1000     3 missing digits      long      long timestamp    digits   1000    decimalDigits       string      NSString  timestampString    NSString stringWithFormat    ld 03d  digits  decimalDigits

User · Answer

It may be useful to know about CodeTimestamps  which provide a wrapper around mach-based timing functions   This gives you nanosecond-resolution timing data - 1000000x more precise than milliseconds   Yes  a million times more precise    The prefixes are milli  micro  nano  each 1000x more precise than the last    Even if you don t need CodeTimestamps  check out the code  it s open source  to see how they use mach to get the timing data   This would be useful when you need more precision and want a faster method call than the NSDate approach   http   eng pulse me line-by-line-speed-analysis-for-ios-apps

User · Answer

Try this    NSDate   timestamp    NSDate dateWithTimeIntervalSince1970   NSDate date  timeIntervalSince1970     NSDateFormatter  dateFormatter     NSDateFormatter alloc  init    dateFormatter setDateFormat   YYYY-MM-dd HH mm ss SSS     NSString  newDateString    dateFormatter stringFromDate timestamp   timestamp    NSDate  newDateString    In this example  dateWithTimeIntervalSince1970 is used in combination of the formatter   YYYY-MM-dd HH mm ss SSS  that will return the date with year  month  day and the time with hours  minutes  seconds  and milliseconds  See the example    2015-12-02 04 43 15 008   I used the NSString to be sure that the format will be has written before

User · Answer

This is basically the same answer as posted by  TristanLorach  just recoded for Swift 3          Method to get Unix-style time  Java variant   i e   time since 1970 in milliseconds  This         copied from here  http   stackoverflow com a 24655601 253938 and here         http   stackoverflow com a 7885923 253938         This should give good performance according to this           http   stackoverflow com a 12020300 253938                 Note that it is possible that multiple calls to this method and computing the difference may         occasionally give problematic results  like an apparently negative interval or a major jump         forward in time  This is because system time occasionally gets updated due to synchronization         with a time source on the network  maybe  leap second    or user setting the clock     public static func currentTimeMillis   - gt  Int64         var darwinTime   timeval   timeval tv sec  0  tv usec  0        gettimeofday  amp darwinTime  nil        return  Int64 darwinTime tv sec    1000    Int64 darwinTime tv usec   1000

User · Answer

func currentmicrotimeTimeMillis   - gt  Int64  let nowDoublevaluseis   NSDate   timeIntervalSince1970 return Int64 nowDoublevaluseis 1000

User · Answer

Timestamp after converting to milliseconds   NSString   timeInMS    NSString stringWithFormat    lld      floor  date timeIntervalSince1970    1000   longLongValue

User · Answer

To get milliseconds for current date   Swift 4    func currentTimeInMilliSeconds  - gt  Int               let currentDate   Date           let since1970   currentDate timeIntervalSince1970         return Int since1970   1000

User · Answer

NSDate timeIntervalSinceReferenceDate  is another option  if you don t want to include the Quartz framework  It returns a double  representing seconds

User · Answer

If you re looking at using this for relative timing  for example for games or animation  I d rather use CACurrentMediaTime    double CurrentTime   CACurrentMediaTime      Which is the recommended way  NSDate draws from the networked synch-clock and will occasionally hiccup when re-synching it against the network   It returns the current absolute time  in seconds     If you want only the decimal part  often used when syncing animations    let ct   CACurrentMediaTime   truncatingRemainder dividingBy  1

User · Answer

This is basically the same answer as posted by  TristanLorach  just recoded for Swift 3          Method to get Unix-style time  Java variant   i e   time since 1970 in milliseconds  This         copied from here  http   stackoverflow com a 24655601 253938 and here         http   stackoverflow com a 7885923 253938         This should give good performance according to this           http   stackoverflow com a 12020300 253938                 Note that it is possible that multiple calls to this method and computing the difference may         occasionally give problematic results  like an apparently negative interval or a major jump         forward in time  This is because system time occasionally gets updated due to synchronization         with a time source on the network  maybe  leap second    or user setting the clock     public static func currentTimeMillis   - gt  Int64         var darwinTime   timeval   timeval tv sec  0  tv usec  0        gettimeofday  amp darwinTime  nil        return  Int64 darwinTime tv sec    1000    Int64 darwinTime tv usec   1000

User · Answer

Swift 2  let seconds   NSDate   timeIntervalSince1970 let milliseconds   seconds   1000 0   Swift 3  let currentTimeInMiliseconds   Date   timeIntervalSince1970 milliseconds

User · Answer

This is what I used for Swift  var date   NSDate   let currentTime   Int64 date timeIntervalSince1970   1000   print  Time in milliseconds is   currentTime      used this site to verify accuracy http   currentmillis com

User · Answer

let timeInMiliSecDate   Date   let timeInMiliSec   Int  timeInMiliSecDate timeIntervalSince1970   1000  print timeInMiliSec

User · Answer

So far I found gettimeofday a good solution on iOS  iPad   when you want to perform some interval evaluation  say  framerate  timing of a rendering frame         include  lt sys time h gt  struct timeval time  gettimeofday  amp time  NULL   long millis    time tv sec   1000     time tv usec   1000

User · Answer

CFAbsoluteTimeGetCurrent    Absolute time is measured in seconds relative to the absolute reference date of Jan 1 2001 00 00 00 GMT  A positive value represents a date after the reference date  a negative value represents a date before it  For example  the absolute time -32940326 is equivalent to December 16th  1999 at 17 54 34  Repeated calls to this function do not guarantee monotonically increasing results  The system time may decrease due to synchronization with external time references or due to an explicit user change of the clock

User · Answer

In Swift we can make a function and do as follows  func getCurrentMillis  - gt Int64      return  Int64 NSDate   timeIntervalSince1970   1000     var currentTime   getCurrentMillis     Though its working fine in Swift 3 0 but we can modify and use the Date class instead of NSDate in 3 0   Swift 3 0  func getCurrentMillis  - gt Int64       return Int64 Date   timeIntervalSince1970   1000     var currentTime   getCurrentMillis

User · Answer

I needed a NSNumber object containing the exact result of   NSDate date  timeIntervalSince1970   Since this function was called many times and I didn t really need to create an NSDate object  performance was not great   So to get the format that the original function was giving me  try this    include  lt sys time h gt  struct timeval tv  gettimeofday  amp tv NULL   double perciseTimeStamp   tv tv sec   tv tv usec   0 000001    Which should give you the exact same result as   NSDate date  timeIntervalSince1970

User · Answer

To get milliseconds for current date   Swift 4    func currentTimeInMilliSeconds  - gt  Int               let currentDate   Date           let since1970   currentDate timeIntervalSince1970         return Int since1970   1000

User · Answer

I benchmarked all the other answers on an iPhone 4S and iPad 3  release builds   CACurrentMediaTime has the least overhead by a small margin  timeIntervalSince1970 is far slower than the others  probably due to NSDate instantiation overhead  though it may not matter for many use cases   I d recommend CACurrentMediaTime if you want the least overhead and don t mind adding the Quartz Framework dependency  Or gettimeofday if portability is a priority for you   iPhone 4S  CACurrentMediaTime  1 33   s call gettimeofday  1 38   s call  NSDate timeIntervalSinceReferenceDate   1 45   s call CFAbsoluteTimeGetCurrent  1 48   s call   NSDate date  timeIntervalSince1970   4 93   s call   iPad 3  CACurrentMediaTime  1 25   s call gettimeofday  1 33   s call CFAbsoluteTimeGetCurrent  1 34   s call  NSDate timeIntervalSinceReferenceDate   1 37   s call   NSDate date  timeIntervalSince1970   3 47   s call

[ios] iPhone: How to get current milliseconds?

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