Hi, # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Europe/London -0:01:15 - LMT 1847 Dec 1 0:00s 0:00 GB-Eire %s 1968 Oct 27 1:00 - BST 1971 Oct 31 2:00u Please direct me to an explanation of the "s" and the "u" in the rules. I looked within the tz_code and tz_data but was unable to find an explanation. Thanks Jim Marvel Software Engineer II Honeywell ESEA CMS 8323 Lindbergh Court Sarasota FL 34243 Phone - 941.360.6209 (alt: 941.360.6213) Fax - 941.355.9241 Jim.Marvel@Honeywell.com<mailto:nancy.ramm@honeywell.com>