Command to get time in milliseconds

Question

Is there a shell command in Linux to get the time in milliseconds

User · Answer

Perl can be used for this  even on exotic platforms like AIX  Example      usr bin perl -w  use strict  use Time  HiRes qw gettimeofday    my   t sec   usec    gettimeofday     my  msec  int   usec 1000    my   sec  min  hour  mday  mon  year  wday  yday  isdst        localtime   t sec    printf   04d- 02d- 02d  02d  02d  02d  03d n       1900  year  1  mon   mday   hour   min   sec   msec

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On OS X  where date does not support the  N flag  I recommend installing coreutils using Homebrew  This will give you access to a command called gdate that will behave as date does on Linux systems   brew install coreutils   For a more  native  experience  you can always add this to your  bash aliases   alias date  gdate    Then execute    date   s N

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The other answers are probably sufficient in most cases but I thought I d add my two cents as I ran into a problem on a BusyBox system   The system in question did not support the  N format option and doesn t have no Python or Perl interpreter   After much head scratching  we  thanks Dave   came up with this   adjtimex   awk    time tv sec time tv usec      printf   06d    2       It extracts the seconds and microseconds from the output of adjtimex  normally used to set options for the system clock  and prints them without new lines  so they get glued together   Note that the microseconds field has to be pre-padded with zeros  but this doesn t affect the seconds field which is longer than six digits anyway  From this it should be trivial to convert microseconds to milliseconds   If you need a trailing new line  maybe because it looks better  then try  adjtimex   awk    time tv sec time tv usec      printf   06d    2      amp  amp  printf   n    Also note that this requires adjtimex and awk to be available  If not then with BusyBox you can point to them locally with   ln -s  bin busybox   adjtimex ln -s  bin busybox   awk   And then call the above as    adjtimex     awk    time tv sec time tv usec      printf   06d    2       Or of course you could put them in your PATH  EDIT   The above worked on my BusyBox device  On Ubuntu I tried the same thing and realised that adjtimex has different versions  On Ubuntu this worked to output the time in seconds with decimal places to microseconds  including a trailing new line   sudo apt-get install adjtimex adjtimex -p   awk   raw time     print  6      I wouldn t do this on Ubuntu though  I would use date   s N

User · Answer

A Python script like this   import time cur time   int time time   1000

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Here is a somehow portable hack for Linux for getting time in milliseconds      bin sh read up rest  lt  proc uptime  t1    up      up      sleep 3      your command read up rest  lt  proc uptime  t2    up      up       millisec     10  t2-t1     echo  millisec   The output is   3010   This is a very cheap operation  which works with shell internals and procfs

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When you use GNU AWK since version 4 1  you can load the time library and do     awk   load  time   BEGIN printf    6f   gettimeofday       This will print the current time in seconds since 1970-01-01T00 00 00 in sub second accuracy       the time   gettimeofday     Return the time in seconds that has elapsed since 1970-01-01 UTC as a floating-point value  If the time is unavailable on this platform  return -1 and set ERRNO  The returned time should have sub-second precision  but the actual precision may vary based on the platform  If the standard C gettimeofday   system call is available on this platform  then it simply returns the value  Otherwise  if on MS-Windows  it tries to use GetSystemTimeAsFileTime         source  GNU awk manual   On Linux systems  the standard C function getimeofday   returns the time in microsecond accuracy

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To show date with time and time-zone     date    d- m- Y  T  N  Z    Output   22-04-2020 18 01 35 970289239 IST

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date    T  N  returns the current time with nanoseconds    06 46 41 431857000  date    T  6N  returns the current time with nanoseconds rounded to the first 6 digits  which is microseconds   06 47 07 183172  date    T  3N  returns the current time with nanoseconds rounded to the first 3 digits  which is milliseconds   06 47 42 773    In general  every field of the date command s format can be given an optional field width

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date command didnt provide milli seconds on OS X  so used an alias from python millis     python -c  quot import time  print int time time   1000   quot      OR alias millis  python -c  quot import time  print int time time   1000   quot     EDIT  following the comment from  CharlesDuffy  Forking any child process takes extra time    time date   s N 1597103627N date   s N  0 00s user 0 00s system 63  cpu 0 006 total  Python is still improving it s VM start time  and it is not as fast as ahead-of-time compiled code  such as date   On my machine  it took about 30ms - 60ms  that is 5x-10x of 6ms taken by date    time python -c  quot import time  print int time time   1000   quot  1597103899460 python -c  quot import time  print int time time   1000   quot   0 03s user 0 01s system 83  cpu 0 053 total  I figured awk is lightweight than python  so awk takes in the range of 6ms to 12ms  i e  1x to 2x of date     time awk   load  quot time quot   BEGIN print int 1000   gettimeofday      1597103729525 awk   load  quot time quot   BEGIN print int 1000   gettimeofday       0 00s user 0 00s system 74  cpu 0 010 total

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Nano is 10-9 and milli 10-3  Hence  we can use the three first characters of nanoseconds to get the milliseconds   date   s 3N   From man date       N     nanoseconds  000000000  999999999        s     seconds since 1970-01-01 00 00 00 UTC   Source  Server Fault s How do I get the current Unix time in milliseconds in Bash

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date   s N returns the number of seconds   current nanoseconds   Therefore  echo      date   s N  1000000   is what you need   Example     echo      date   s N  1000000   1535546718115   date   s returns the number of seconds since the epoch  if that s useful

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I just wanted to add to Alper s answer what I had to do to get this stuff working   On Mac  you ll need brew install coreutils  so we can use gdate  Otherwise on Linux  it s just date  And this function will help you time commands without having to create temporary files or anything   function timeit         start  gdate   s N      bash -c  1     end  gdate   s N      runtime     end-start  1000000000 0       echo   seconds      And you can use it with a string   timeit  tsc --noEmit

[linux] Command to get time in milliseconds

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