如何生成Unix时间戳?

相关的问题是“Datetime到Unix时间戳”，但这个问题更一般。

我需要Unix时间戳来解决最后一个问题。我的兴趣是Python、Ruby和Haskell，但也欢迎其他方法。

生成Unix时间戳最简单的方法是什么?

当前回答

在Haskell

import Data.Time.Clock.POSIX

main :: IO ()
main = print . floor =<< getPOSIXTime

在去

import "time"
t := time.Unix()

in C

time(); // in time.h POSIX

// for Windows time.h
#define UNIXTIME(result)   time_t localtime; time(&localtime); struct tm* utctime = gmtime(&localtime); result = mktime(utctime);

在斯威夫特

NSDate().timeIntervalSince1970 // or Date().timeIntervalSince1970

2017-05-18 21:38:17

其他回答

在Haskell

import Data.Time.Clock.POSIX

main :: IO ()
main = print . floor =<< getPOSIXTime

在去

import "time"
t := time.Unix()

in C

time(); // in time.h POSIX

// for Windows time.h
#define UNIXTIME(result)   time_t localtime; time(&localtime); struct tm* utctime = gmtime(&localtime); result = mktime(utctime);

在斯威夫特

NSDate().timeIntervalSince1970 // or Date().timeIntervalSince1970

2017-05-18 21:38:17

对于类unix环境，以下操作可以工作。

# Current UNIXTIME
unixtime() {
  datetime2unixtime "$(date -u +'%Y-%m-%d %H:%M:%S')"
}

# From DateTime（%Y-%m-%d %H:%M:%S）to UNIXTIME
datetime2unixtime() {
  set -- "${1%% *}" "${1##* }"
  set -- "${1%%-*}" "${1#*-}" "${2%%:*}" "${2#*:}"
  set -- "$1" "${2%%-*}" "${2#*-}" "$3" "${4%%:*}" "${4#*:}"
  set -- "$1" "${2#0}" "${3#0}" "${4#0}" "${5#0}" "${6#0}"
  [ "$2" -lt 3 ] && set -- $(( $1-1 )) $(( $2+12 )) "$3" "$4" "$5" "$6"
  set -- $(( (365*$1)+($1/4)-($1/100)+($1/400) )) "$2" "$3" "$4" "$5" "$6"
  set -- "$1" $(( (306*($2+1)/10)-428 )) "$3" "$4" "$5" "$6"
  set -- $(( ($1+$2+$3-719163)*86400+$4*3600+$5*60+$6 ))
  echo "$1"
}

# From UNIXTIME to DateTime format（%Y-%m-%d %H:%M:%S）
unixtime2datetime() {
  set -- $(( $1%86400 )) $(( $1/86400+719468 )) 146097 36524 1461
  set -- "$1" "$2" $(( $2-(($2+2+3*$2/$3)/$5)+($2-$2/$3)/$4-(($2+1)/$3) ))
  set -- "$1" "$2" $(( $3/365 ))
  set -- "$@" $(( $2-( (365*$3)+($3/4)-($3/100)+($3/400) ) ))
  set -- "$@" $(( ($4-($4+20)/50)/30 ))
  set -- "$@" $(( 12*$3+$5+2 ))
  set -- "$1" $(( $6/12 )) $(( $6%12+1 )) $(( $4-(30*$5+3*($5+4)/5-2)+1 ))
  set -- "$2" "$3" "$4" $(( $1/3600 )) $(( $1%3600 ))
  set -- "$1" "$2" "$3" "$4" $(( $5/60 )) $(( $5%60 ))
  printf "%04d-%02d-%02d %02d:%02d:%02d\n" "$@"
}

# Examples
unixtime # => Current UNIXTIME
date +%s # Linux command

datetime2unixtime "2020-07-01 09:03:13" # => 1593594193
date -u +%s --date "2020-07-01 09:03:13" # Linux command

unixtime2datetime "1593594193" # => 2020-07-01 09:03:13
date -u --date @1593594193 +"%Y-%m-%d %H:%M:%S" # Linux command

https://tech.io/snippet/a3dWEQY

2021-07-02 00:07:25

在Ruby中: