How to get current timestamp in milliseconds since 1970 just the way Java gets

Question

In Java  we can use System currentTimeMillis   to get the current timestamp in Milliseconds since epoch time which is -     the difference  measured in milliseconds  between the current time and   midnight  January 1  1970 UTC    In C   how to get the same thing   Currently I am using this to get the current timestamp -   struct timeval tp  gettimeofday  amp tp  NULL   long int ms   tp tv sec   1000   tp tv usec   1000    get current timestamp in milliseconds  cout  lt  lt  ms  lt  lt  endl    This looks right or not

User · Answer

use  lt sys time h gt   struct timeval tp  gettimeofday  amp tp  NULL   long int ms   tp tv sec   1000   tp tv usec   1000    refer this

User · Answer

Since C  11 you can use std  chrono    get current system time  std  chrono  system clock  now   get time since epoch   time since epoch   translate the underlying unit to milliseconds  duration cast lt milliseconds gt  d  translate std  chrono  milliseconds to integer  uint64 t to avoid overflow     include  lt chrono gt   include  lt cstdint gt   include  lt iostream gt   uint64 t timeSinceEpochMillisec       using namespace std  chrono    return duration cast lt milliseconds gt  system clock  now   time since epoch    count       int main       std  cout  lt  lt  timeSinceEpochMillisec    lt  lt  std  endl    return 0

User · Answer

This answer is pretty similar to Oz  s  using  lt chrono gt  for C   -- I didn t grab it from Oz  though     I picked up the original snippet at the bottom of this page  and slightly modified it to be a complete console app  I love using this lil  ol  thing  It s fantastic if you do a lot of scripting and need a reliable tool in Windows to get the epoch in actual milliseconds without resorting to using VB  or some less modern  less reader-friendly code    include  lt chrono gt   include  lt iostream gt   int main         unsigned   int64 now   std  chrono  duration cast lt std  chrono  milliseconds gt  std  chrono  system clock  now   time since epoch    count        std  cout  lt  lt  now  lt  lt  std  endl      return 0

User · Answer

If using gettimeofday you have to cast to long long otherwise you will get overflows and thus not the real number of milliseconds since the epoch    long int msint   tp tv sec   1000   tp tv usec   1000  will give you a number like 767990892 which is round 8 days after the epoch  -    int main int argc  char  argv          struct timeval tp      gettimeofday  amp tp  NULL       long long mslong    long long  tp tv sec   1000L   tp tv usec   1000    get current timestamp in milliseconds     std  cout  lt  lt  mslong  lt  lt  std  endl

User · Answer

Include  lt ctime gt  and use the time function

User · Answer

If you have access to the C   11 libraries  check out the std  chrono library  You can use it to get the milliseconds since the Unix Epoch like this    include  lt chrono gt           using namespace std  chrono  milliseconds ms   duration cast lt  milliseconds  gt       system clock  now   time since epoch

[c++] How to get current timestamp in milliseconds since 1970 just the way Java gets

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