Version:           3.4.1 (using KDE 3.4.3, Kubuntu Package 4:3.4.3-0ubuntu1 )
Compiler:          Target: i486-linux-gnu
OS:                Linux (i686) release 2.6.12-9-386

In diff outputs, the timestamp does not always appear.

When the --label is used to replace the filename with an arbitrary label, no timestamp is displayed in the diff line.

kompare should probably treat the timestamps as optional, so as to not fail on diff outputs when --label was used.  Example:

$ diff --label a afile --label b bfile -u
--- a
+++ b
@@ -1,30 +1,533 @@
...<more output>...

kompare is unwilling to parse the "---" and "+++" lines when they don't contain timestamps.