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    <p>Sorry, brief moment of synapse failure. Here's the real answer.</p> <pre><code>require 'date' Time.at(seconds_since_epoch_integer).to_datetime </code></pre> <p><strong>Brief example</strong> (this takes into account the current system timezone):</p> <pre><code>$ date +%s 1318996912 $ irb ruby-1.9.2-p180 :001 &gt; require 'date' =&gt; true ruby-1.9.2-p180 :002 &gt; Time.at(1318996912).to_datetime =&gt; #&lt;DateTime: 2011-10-18T23:01:52-05:00 (13261609807/5400,-5/24,2299161)&gt; </code></pre> <p><strong>Further update</strong> (for UTC):</p> <pre><code>ruby-1.9.2-p180 :003 &gt; Time.at(1318996912).utc.to_datetime =&gt; #&lt;DateTime: 2011-10-19T04:01:52+00:00 (13261609807/5400,0/1,2299161)&gt; </code></pre> <p><strong>Recent Update</strong>: I benchmarked the top solutions in this thread while working on a HA service a week or two ago, and was surprised to find that <code>Time.at(..)</code> outperforms <code>DateTime.strptime(..)</code> (update: added more benchmarks).</p> <pre><code># ~ % ruby -v # =&gt; ruby 2.1.5p273 (2014-11-13 revision 48405) [x86_64-darwin13.0] irb(main):038:0&gt; Benchmark.measure do irb(main):039:1* ["1318996912", "1318496912"].each do |s| irb(main):040:2* DateTime.strptime(s, '%s') irb(main):041:2&gt; end irb(main):042:1&gt; end =&gt; #&lt;Benchmark ... @real=2.9e-05 ... @total=0.0&gt; irb(main):044:0&gt; Benchmark.measure do irb(main):045:1&gt; [1318996912, 1318496912].each do |i| irb(main):046:2&gt; DateTime.strptime(i.to_s, '%s') irb(main):047:2&gt; end irb(main):048:1&gt; end =&gt; #&lt;Benchmark ... @real=2.0e-05 ... @total=0.0&gt; irb(main):050:0* Benchmark.measure do irb(main):051:1* ["1318996912", "1318496912"].each do |s| irb(main):052:2* Time.at(s.to_i).to_datetime irb(main):053:2&gt; end irb(main):054:1&gt; end =&gt; #&lt;Benchmark ... @real=1.5e-05 ... @total=0.0&gt; irb(main):056:0* Benchmark.measure do irb(main):057:1* [1318996912, 1318496912].each do |i| irb(main):058:2* Time.at(i).to_datetime irb(main):059:2&gt; end irb(main):060:1&gt; end =&gt; #&lt;Benchmark ... @real=2.0e-05 ... @total=0.0&gt; </code></pre>
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    1. POHow to convert a unix timestamp (seconds since epoch) to Ruby DateTime?
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    1. USAlan W. Smith
    1. USAdam Eberlin
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    1. COThank you... The following answer is a little more succinct, I found Time.at but was trying to find a DateTime equivalent.
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      1. USTronathan
    2. COIt's funny but Time.at().to_datetime seems more pleasant than DateTime.strptime() simply because of readability...At least to me anyway
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      1. UStybro0103
    3. COThis is not the same as the above anser, Time.at assumes current timezone, where DateTime.strptime uses UTC.
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      1. USVitaly Babiy
 

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