javascript – Count number of span id by date

In a PHP page I have a list of results.

I want to get the number of results by date in order to display a pie chart.

It\’s what i have:

<span id=\"tweetdate_1_12-11-2012\">...</span> 
<span id=\"tweetdate_2_12-11-2012\">...</span>
<span id=\"tweetdate_3_12-11-2012\">...</span> 
<span id=\"tweetdate_4_12-11-2012\">...</span>
<span id=\"tweetdate_1_11-11-2012\">...</span> 
<span id=\"tweetdate_2_11-11-2012\">...</span>
<span id=\"tweetdate_1_10-11-2012\">...</span> 
<span id=\"tweetdate_2_10-11-2012\">...</span>

I want to get in javascript :

1. The dates like this: 10-11-2012, 11-11-2012, 12-11-2012

2. The number of results by dates: 2, 2, 4

I have recovered the dates but not in the good order (olded first) and not the number of theses dates.

Is it possible?

Thanks

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