--- a/common/autoconf/jdk-version.m4	Wed Dec 07 09:23:37 2016 +0100
+++ b/common/autoconf/jdk-version.m4	Wed Dec 07 09:46:39 2016 +0100
@@ -160,11 +160,10 @@
     fi
   else
     if test "x$NO_DEFAULT_VERSION_PARTS" != xtrue; then
-      # Default is to calculate a string like this <timestamp>.<username>.<base dir name>
-      timestamp=`$DATE '+%Y-%m-%d-%H%M%S'`
+      # Default is to calculate a string like this 'adhoc.<username>.<base dir name>'
       # Outer [ ] to quote m4.
       [ basedirname=`$BASENAME "$TOPDIR" | $TR -d -c '[a-z][A-Z][0-9].-'` ]
-      VERSION_OPT="$timestamp.$USERNAME.$basedirname"
+      VERSION_OPT="adhoc.$USERNAME.$basedirname"
     fi
   fi