how to calculate time during mousedown event in jquery?

I am trying to do 2 different functionalities on one button on mousedown - up events.
But its not working as i cant able to detect time on mousedown event.

var flag;  
 $("#ClikerButton").mousedown(function(e){  
     //if mouse pressed more than 2 sec, then  
     // do func1 and set flag = true;  
          //else do nothing  
 }).mouseup(function(e){  
 //if flag == true, do nothing,  
 //else do func2;  
 });  
 

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