日期差

function daysBetween(DateOne,DateTwo){  

    var OneMonth = DateOne.substring(5,DateOne.lastIndexOf ('-')); 

    var OneDay = DateOne.substring(DateOne.length,DateOne.lastIndexOf ('-')+1); 

    var OneYear = DateOne.substring(0,DateOne.indexOf ('-')); 

    var TwoMonth = DateTwo.substring(5,DateTwo.lastIndexOf ('-')); 

    var TwoDay = DateTwo.substring(DateTwo.length,DateTwo.lastIndexOf ('-')+1); 

    var TwoYear = DateTwo.substring(0,DateTwo.indexOf ('-')); 

    var cha=((Date.parse(OneMonth+'/'+OneDay+'/'+OneYear)- Date.parse(TwoMonth+'/'+TwoDay+'/'+TwoYear))/86400000);

    return Math.abs(cha);  
}