According to http://www.w3.org/TR/NOTE-datetime (and other random sources), the iso format for date+time in one field is YYYY-MM-DDThh:mm:ssTZD (eg 1997-07-16T19:20:30+01:00), ie no spaces around the "T" but iso8601DateFormat outputs a space after the day if the timeFmt is not Nothing, so formatTime System.Locale.defaultTimeLocale (System.Locale.iso8601DateFormat (Just "T%H:%M:%SZ")) (UTCTime (fromGregorian 2007 10 20) 26540) yeilds "2007-10-20 T07:22:20Z". I reckon this is a bug, but at the very least it's not a good design. Please can we change Just fmt -> ' ' : fmt to Just fmt -> fmt ? if someone wants a space, they can put it in the string, but it's a pain to take it out when you want the one field format with a T there. -- Jón Fairbairn Jon.Fairbairn@cl.cam.ac.uk