Sorry about wasing time - Apparently NZ daylisght saving time finished on March 20, 1947 , and on March 3, 1980, and March 20, 2000 . I'm impressed that R knows all of this Laimonis -- Dr Laimonis Kavalieris Department of Mathematics and Statistics University of Otago PO Box 56 Dunedin New Zealand Tel (64)(3)479 7780 Fax (64)(3)479 8427