See the answer in the FAQ to Q: Will named be affected by the 2007 changes to daylight savings rules in the US. http://www.isc.org/index.pl?/sw/bind/FAQ.php -- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: Mark_Andrews at isc.org