JavaScriptで時間を扱うならMoment.js

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var now = moment();

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var date = moment.unix(1318781876);

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now.format(); // => 2014-05-22T16:53:16+09:00
date.format('YYYY/MM/DD'); // => 2011/10/17

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date.fromNow(); // => 3 years ago

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var now = moment();
console.debug('now:', now.format());

var date = moment.unix(1318781876);
console.debug('date:', date.format('YYYY/MM/DD'));

console.debug('fromNow:', date.fromNow());

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yo webapp
bower install -S momentjs
grunt bowerInstall
grunt serve