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I have a UNIX timestamp and I'd like to get a formatted date (like the output of date) corresponding to that timestamp.

My attempts so far:

$ date +%s
$ date -d 1282367908
date: invalid date `1282367908'
$ date -d +1282367908
date: invalid date `+1282367908'
$ date +%s -d +1282367908
date: invalid date `+1282367908'

I'd like to be able to get output like:

$ TZ=UTC somecommand 1282368345
Sat Aug 21 05:25:45 UTC 2010
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up vote 37 down vote accepted

On Mac OS X and BSD:

$ date -r 1282368345
Sat Aug 21 07:25:45 CEST 2010
$ date -r 1282368345 +%Y-%m-%d

with GNU core tools (you have to dig through the info file for that):

$ date -d @1282368345
Sat Aug 21 07:25:45 CEST 2010
$ date -d @1282368345 --rfc-3339=date
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It takes a lot of digging, though, which is surprising for such a common task. – David Z Aug 21 '10 at 8:04
Thanks, accepted your answer. I should have read info coreutils date a little more carefully. – Umang Aug 21 '10 at 8:27
This is giving me a slightly different date: date -r 1447264553943 results in Wed Dec 28 01:39:03 BRST 47831, when it's actually 11/11/2015, 3:55:53 PM GMT-2:00. – falmp Nov 11 '15 at 18:01
@falmp: it will work if you use seconds instead of microseconds. – hop Nov 12 '15 at 16:03
@hop ops, should have figured with the year being 47831, but that number was so high I missed it. Thanks! – falmp Nov 12 '15 at 22:25

This perl one-liner will do it:

$ perl -e 'print scalar localtime $ARGV[0]' 1282367908
Sat Aug 21 09:18:28 2010
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After some googling, I found way to do it with the date command only:

$ date --date "Jan 1, 1970 00:00:00 +0000 + 1282367908 seconds"
Sat Aug 21 09:18:28 MSD 2010
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Thanks for that. I was hoping there'd be something simpler, so just an up vote for now. – Umang Aug 21 '10 at 6:36
another great example for how google makes you stupid. does nobody ever read the documentation anymore? – hop Aug 21 '10 at 7:28

Another neat example of the rich heritage of modern Unix. This is indeed possible under most BSD variants:

$ TZ=UTC date -r 1282368345
Sat Aug 21 05:25:45 UTC 2010

(BTW your example seems to be off by one second)

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Doesn't work on Linux. hop's answer seems to have the correct Linux answer. Thanks for pointing that out, I suspected something like that would happen, I've made it 45 seconds now. – Umang Aug 21 '10 at 8:21

Answer to an old question, but I think this might be an improvement if anyone else searches for this. This Bash function works on both Linux and OS X. I have not tested on any other BSD systems. Pass the epoch time as an argument to this function and it will print the RFC-3339 time format.

epochtorfc3339 ()
    EPOCH=$(echo $@ | sed -n "s/.*\([0-9]\{10\}\).*/\1/p");
    if date --version >/dev/null 2>/dev/null; then
        # Linux
        date ${RFC3339_FORMAT} -d "1970-01-01 UTC ${EPOCH} seconds"
        #date -d @${EPOCH} --rfc-3339=seconds
        # OS X/BSD
        date -r ${EPOCH} ${RFC3339_FORMAT}
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