I may be blind, but as far as I can tell from both the text and the BNF, EDTF's maximum precision is one second. OK, That's considerably more limited than ISO 8601, which allows unlimited precision! For example, "13:10:30,7" is 30.7 sec. after 13:10, with precision of 1/10 second. And some people seem actually to be using 8601 with millisecond resolution -- for example, see the Joda.org website: http://joda-time.sourceforge.net/cal_iso.html . I assume that this is either my mistake or a mistake in the EDTF proposal? Surely it's not a good idea to add any further limitations to 8601. --Don -- Donald Byrd Woodrow Wilson Indiana Teaching Fellow Adjunct Associate Professor of Informatics Visiting Scientist, Research Technologies Indiana University Bloomington