How can I generate Unix timestamps

Question

Related question is  Datetime To Unix timestamp   but this question is more general    I need Unix timestamps to solve my last question  My interests are Python  Ruby and Haskell  but other approaches are welcome   What is the easiest way to generate Unix timestamps

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In Linux or MacOS you can use   date   s   where      s  seconds since 1970-01-01 00 00 00 UTC   GNU Coreutils 8 24 Date manual    Example output now 1454000043

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Let s try JavaScript   var t   Math floor  new Date   getTime      1000        or even nicer  the static approach   var t   Math floor Date now     1000     In both cases I divide by 1000 to go from seconds to millis and I use Math floor to only represent whole seconds that have passed  vs  rounding  which might round up to a whole second that hasn t passed yet

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In Perl    gt  gt  time   gt  1335552733

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First of all  the Unix  epoch  or zero-time is 1970-01-01 00 00 00Z  meaning midnight of 1st January 1970 in the Zulu or GMT or UTC time zone    A Unix time stamp is the number of seconds since that time - not accounting for leap seconds   Generating the current time in Perl is rather easy   perl -e  print time    n     Generating the time corresponding to a given date time value is rather less easy   Logically  you use the strptime   function from POSIX   However  the Perl POSIX  strptime module  which is separate from the POSIX module  has the signature     sec   min   hour   mday   mon   year   wday   yday                                          POSIX  strptime  string    Format      The function mktime in the POSIX module has the signature   mktime sec  min  hour  mday  mon  year  wday   0  yday   0  isdst   0    So  if you know the format of your data  you could write a variant on   perl -MPOSIX -MPOSIX  strptime -e        print mktime POSIX  strptime  2009-07-30 04 30     Y- m- d  H  M       n

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The unix  date  command is surprisingly versatile    date -j -f   a  b  d  T  Z  Y    date      s    Takes the output of date  which will be in the format defined by -f  and then prints it out  -j says don t attempt to set the date  in the form   s  seconds since epoch

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curl icanhazepoch com  Basically it s unix timestamps as a service  UTaaS

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date   s  N   where  GNU Coreutils 8 24 Date manual      s  seconds since 1970-01-01 00 00 00 UTC   N  nanoseconds  000000000  999999999  since epoch    Example output now 1454000043 704350695   I noticed that BSD manual of date did not include precise explanation about the flag   s

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in Haskell  import Data Time Clock POSIX  main    IO    main   print   floor   lt  lt  getPOSIXTime   in Go  import  time  t    time Unix     in C  time       in time h POSIX     for Windows time h  define UNIXTIME result    time t localtime  time  amp localtime   struct tm  utctime   gmtime  amp localtime   result   mktime utctime     in Swift  NSDate   timeIntervalSince1970    or Date   timeIntervalSince1970

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nawk     nawk  BEGIN print srand        Works even on old versions of Solaris and probably other UNIX systems  where    date   s    isn t implemented Doesn t work on Linux and other distros where the posix tools have been replaced with the GNU versions  nawk -  gawk etc   Pretty unintuitive but definitelly amusing  -

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In Bash 5 there s a new variable   echo  EPOCHSECONDS   Or if you want higher precision  in microseconds    echo  EPOCHREALTIME

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If you need a Unix timestamp from a shell script  Bourne family  sh  ksh  bash  zsh        this should work on any Unix machine as unlike the other suggestions  perl  haskell  ruby  python  GNU date   it is based on a POSIX standard command and feature   PATH  getconf PATH  awk  BEGIN  srand   print srand

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In python add the following lines to get a time stamp    gt  gt  gt  import time  gt  gt  gt  time time   1335906993 995389  gt  gt  gt  int time time    1335906993

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For completeness  PHP   php -r  echo time       In BASH   clitime   php -r  echo time      echo  clitime

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public static Int32 GetTimeStamp                 try                       Int32 unixTimeStamp              DateTime currentTime   DateTime Now              DateTime zuluTime   currentTime ToUniversalTime                DateTime unixEpoch   new DateTime 1970  1  1               unixTimeStamp    Int32  zuluTime Subtract unixEpoch   TotalSeconds              return unixTimeStamp                    catch  Exception ex                        Debug WriteLine ex               return 0

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If I want to print utc date time using date command I need to using -u argument with date command   Example  date -u   Output  Fri Jun 14 09 00 42 UTC 2019

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In Haskell     To get it back as a POSIXTime type   import Data Time Clock POSIX getPOSIXTime   As an integer   import Data Time Clock POSIX round  fmap  getPOSIXTime

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With NodeJS  just open a terminal and type   node -e  console log new Date   getTime     or node -e  console log Date now

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in Ruby    gt  gt  Time now to i   gt  1248933648

[unix] How can I generate Unix timestamps?

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