Add the isodate utility.

This utility provides a way to display dates in ISO8601 format. The
exact output format can be controlled. It can either display dates
passed on the commandline or it can display the current date/time.

src/isodate/build.monolithic

@@ -0,0 +1,18 @@
+# These are external variables, and shouldn't clash with anything else
+#  isodate_MONOLITHIC
+#
+
+SRC="obj/isodate.c"
+MONOLITHIC_TESTS="src/isodate/build.app src/isodate/build.monolithic"
+
+if [ -z "${isodate_MONOLITHIC}" ]
+then
+    MONOLITHIC_SOURCE="$(echo src/isodate/*.c)"
+    make_monolithic ${SRC} C || return 1
+
+    isodate_MONOLITHIC=1
+    MONOLITHIC_DOC="${MONOLITHIC_DOC} ${SRC}"
+fi
+
+# kate: replace-trailing-space-save true; space-indent true; tab-width 4;
+# vim: syntax=sh:expandtab:ts=4:sw=4