+@node Combined date and time of day items
+@section Combined date and time of day items
+
+@cindex combined date and time of day item
+
+A @dfn{combined date and time of day item} specifies the time on a
+specific day of the year. This type is needed for formats that cannot
+be represented by individual calendar date (@pxref{Calendar date items})
+and time of day (@pxref{Time of day items}) items due to ambiguity.
+
+@example
+# ISO 8601 extended date and time of day format
+1972-09-24T20:02:00,000000-0500
+@end example
+
+@cindex @sc{iso} 8601 date and time of day format
+@cindex date and time of day format, @sc{iso} 8601
+
+The @sc{iso} 8601 extended date and time of day format is an @sc{iso}
+8601 date, a @samp{T} character separator, followed by an @sc{iso} 8601 time
+of day.
+
+