Convert text variables containing mm-dd-yyyy to a date format so I can compare

Uncle, I cry uncle....  I've browsed a bunch of code and can't seem to hone in on what I need.

I have two date variables let's call them date1 date2.  they are strings always in the format of mm-dd-yyyy.    All I want to do is determine the number of days between these two dates.  I'm pretty sure I first need to convert these to another format but I'm not sure how to code this... can someone show me the javascript code to do this?

Thanks,
aviator21114Asked:
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GaryCommented:
<script>
date1="12-01-2013"
date2="12-12-2013"

// get the parts of the date
date1=date1.split("-");
date2=date2.split("-");

// rebuild the date so js understands it and convert to millisecs
date1=new Date(date1[2], date1[0] - 1, date1[1]).getTime();
date2=new Date(date2[2], date2[0] - 1, date2[1]).getTime();

// difference between the dates in millisecs
var difference = Math.abs(date1 - date2)

// divide result by number of millisecs in a day (rounded to a whole)
alert(Math.round(difference/86400000))
</script>

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Dan CraciunIT ConsultantCommented:
Use gettime() on your dates:

(date1.getTime() - date2.getTime() )/ (24*60*60*1000)

will give you the number of days between the dates

HTH,
Dan
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aviator21114Author Commented:
GaryC123.... what's happening on lines 10 and 11 with the subscripts?  Date1(0) -1 can you define this construct?
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Dan CraciunIT ConsultantCommented:
Your months are in range 1-12 and JS needs them in the range 0-11.
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GaryCommented:
It's building the date as a date object 2013,11,01 - this is how js will understand it.

The 11 is not a mistake - months in js start from 0 to 11
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