Digging around a bit, I found this web page ( http://www.webexhibits.org/daylightsaving/b2.html ), which covers the US and Europe. It has some javascript for figuring out the days the time changes in different years. Maybe I can figure out how it could be adapted to use a user supplied rule for when the time change is. Their code looks pretty simple. Harold --=20 FCC Rules Updated Daily at http://www.hallikainen.com - Advertising opportunities available! --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .