javascript - uk to us date

function convertUKtoUSdate(ukDate) {
    var tmpDate = ukDate;

    if (tmpDate.indexOf(" ", 0) > 0) {
        tmpDate = tmpDate.slice(0, tmpDate.indexOf(" ", 0) + 1); 
    }

    var sl = tmpDate.length;
    s1 = tmpDate.indexOf("/", 0);
    var s2 = tmpDate.indexOf("/", s1 + 1);

    var ukDate = tmpDate.slice(s1 + 1, s2) + "/" + tmpDate.slice(0, s1) + "/" + tmpDate.slice(s2 + 1, sl);

    ukDate = new Date(ukDate);
    return ukDate
}