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Portable way of translating epoch time

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# 1  
Old 03-13-2017
Portable way of translating epoch time
Code:
echo $(date +%s) | awk '{ print strftime("%c", $2"-"$3"-"$NF"/"$4); }'

The above command only seems to work on newer versions of awk or systems with gawk installed.


how can i translate the epoch time into a human readable format using a portable method?

also,
Code:
date -d@$epochtime

does not work on systems like AIX. so thats not portable.
Last edited by SkySmart; 03-13-2017 at 04:22 PM..
# 2  
Old 03-13-2017
I'd feel somewhat surprised if above would print anything reasonable. date +%s (WHY the echo, BTW ?) prints sth. like 1489436283, so in the following awk, NF is 1, and all the fields referenced are undefined.

Recent shells (bash, ksh, ...) offer a printf builtin with the %(...)T format specifier:
Code:
printf "%(%F %T)T\n", $ET
2017-03-13 21:23:02

These 2 Users Gave Thanks to RudiC For This Post:
drl SkySmart
# 3  
Old 03-13-2017
I typically recommend using perl for a portable solution to this type of problem, most OS have it installed by default:

Code:
$ perl -e 'use POSIX; print strftime($ARGV[0]."\n", localtime(time() + $ARGV[1]));' '%c' $((10 * 60 * 60))
Tue, Mar 14, 2017  2:45:50 AM

These 3 Users Gave Thanks to Chubler_XL For This Post:
Corona688 drl SkySmart
# 4  
Old 03-14-2017
Hi.

The command found here General Purpose Date Script can be used like:
Code:
date.pl -d "@$(date +%s)"

producing:
Code:
2017-03-14 10:52:23

Thank Corona688 if you use it.

My name for it is date.pl -- here are some details:
Code:
date.pl  GNU date work-alike. (what)
Path    : ~/bin/date.pl
Version : - ( local: RepRev 1.13, ~/bin/date.pl, 2016-09-11 )
Length  : 378 lines
Type    : Perl script, ASCII text executable
Shebang : #!/usr/bin/env perl
Help    : probably available with --help
Home    : https://www.unix.com/tips-tutorials/239167-general-purpose-date-script.html
Modules : (for perl codes)
 POSIX  1.38_03
 strict 1.08
 warnings       1.23
 constant       1.31

This is one of the codes in my new system toolbox that I carry with me to new environments.

Best wishes ... cheers, drl
Last edited by drl; 03-14-2017 at 01:01 PM.. Reason: Another correction.
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