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Javascript Converting human time to timestamp
var d = new Date("Wed Jun 20 19:20:44 +0000 2012");
d.getTime(); //returns 1340220044000

//OR

Date.parse("Wed Jun 20 19:20:44 +0000 2012"); //returns 1340220044000

//if you want to truncate ms instead of rounding just use Math.floor()
Math.round(Date.parse("Wed Jun 20 19:20:44 +0000 2012") / 1000); //returns 1340220044

//Gets date in seconds
var d1 = Date.parse('Wed Jun 20 19:20:44 +0000 2012')/1000;
alert(d1);