How to display Unix time in the timestamp format?

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Chapters
00:00 How To Display Unix Time In The Timestamp Format?
00:19 Accepted Answer Score 75
00:31 Answer 2 Score 1
00:57 Answer 3 Score 3
01:06 Answer 4 Score 1
01:51 Thank you

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Full question
https://superuser.com/questions/165680/h...

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Content licensed under CC BY-SA
https://meta.stackexchange.com/help/lice...

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Tags
#unix #debian #date #timestamp

#avk47

ACCEPTED ANSWER

Score 75

You can do this with

date +%s

For more possibilities, see

man date

ANSWER 2

Score 3

My favorite way:

perl -e 'print time'

ANSWER 3

Score 1

srand without a value uses the current timestamp with these Awk implementations:

gawk
gawk --posix
mawk 1.3.3
nawk

so you can use Awk:

awk 'BEGIN {srand(); print srand()}'

Or the awk Velour library:

velour -n 'print t_now()'

ANSWER 4

Score 1

The following will convert Date Time to Unix time on Unix-like environment.

# 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