lib/rrule.js
function check_bymonth(rules, dt) {
    if(!rules || !rules.length) return true;
    return rules.indexOf(m(dt)) !== -1;
}
function check_bymonth(rules, dt) {
    if(!rules || !rules.length) return true;
    return rules.indexOf(m(dt)) !== -1;
}
function check_bymonth ( rules , dt ) { if ( ! rules || ! rules . length ) return true ; return rules . indexOf ( m ( dt ) ) !== - 1 ; }
Check that a particular date is within the limits designated by the BYMONTH rule
Check that a particular date is within the limits designated by the BYMONTH rule