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function prettyDate(date_str){
var time_formats = [
[60, 'just now', 1], // 60
[120, '1 minute ago', '1 minute from now'], // 60*2
[3600, 'minutes', 60], // 60*60, 60
[7200, '1 hour ago', '1 hour from now'], // 60*60*2
[86400, 'hours', 3600], // 60*60*24, 60*60
[172800, 'yesterday', 'tomorrow'], // 60*60*24*2
[604800, 'days', 86400], // 60*60*24*7, 60*60*24
[1209600, 'last week', 'next week'], // 60*60*24*7*4*2
[2419200, 'weeks', 604800], // 60*60*24*7*4, 60*60*24*7
[4838400, 'last month', 'next month'], // 60*60*24*7*4*2
[29030400, 'months', 2419200], // 60*60*24*7*4*12, 60*60*24*7*4
[58060800, 'last year', 'next year'], // 60*60*24*7*4*12*2
[2903040000, 'years', 29030400], // 60*60*24*7*4*12*100, 60*60*24*7*4*12
[5806080000, 'last century', 'next century'], // 60*60*24*7*4*12*100*2
[58060800000, 'centuries', 2903040000] // 60*60*24*7*4*12*100*20, 60*60*24*7*4*12*100
];
var time = ('' + date_str).replace(/-/g,"/").replace(/[TZ]/g," ").replace(/^\s\s*/, '').replace(/\s\s*$/, '');
if(time.substr(time.length-4,1)==".") time =time.substr(0,time.length-4);
var seconds = (new Date - new Date(time)) / 1000;
var token = 'ago', list_choice = 1;
if (seconds < 0) {
seconds = Math.abs(seconds);
token = 'from now';
list_choice = 2;
}
var i = 0, format;
while (format = time_formats[i++])
if (seconds < format[0]) {
if (typeof format[2] == 'string')
return format[list_choice];
else
return Math.floor(seconds / format[2]) + ' ' + format[1] + ' ' + token;
}
return time;
};
prettyDate("2010-08-28T20:24:17Z") // => "2 hours ago"
prettyDate("2010-08-27T22:24:17Z") // => "Yesterday"
prettyDate("2010-08-26T22:24:17Z") // => "2 days ago"
prettyDate("2010-08-14T22:24:17.000Z") // => "2 weeks ago"
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