function getDaysFromDate(yy:int, mm:int, dd:int, gh:int):int{
var da:Date = new Date(yy, mm, dd, gh, 0, 0) ;
return da.getTime()/86400000 ;
} // trace( getDaysFromDate(2011, 9, 27, 8) ) ;
function getDateFromDays(dd:int, gh:int):Date{
var da:Date = new Date(dd*86400000-gh*3600000) ;
return da ;
} // trace( getDateFromDays(15274, 8) ) ;