for local time keeping with NEMA strings we just use a local offset with DST rules. Thomas D. Erb o: 508-359-9684 p: 508-359-4396 x 1700 f: 508-359-4482 a: 97 West Street, Medfield, MA 02052 USA e: tde at electrictime.com w: www.electrictime.com<http://www.electrictime.com> Tower & Street Clocks Since 1928