Fantasista

function cntTime( frYyyyMmDd) {
    var frDt = new Date( frYyyyMmDd.substring(0, 4), frYyyyMmDd.substring(5, 7) - 1, frYyyyMmDd.substring(8, 10) );
    var toDt = new Date();
    var tmp    = toDt.getTime() - frDt.getTime();
    var dayCnt = ( tmp / 60 / 60 / 1000 );
    return dayCnt;
}