4J

As many have discovered, there is a annoying bug in the Tcl version shipped with Debian/Ubuntu (which may not be the case with the latest Ubuntu - I am still one release behind on my day-to-day laptop). In any case, here is my fix:

In the file /usr/share/tkcvs/cvs.tcl search for the line "set juliandate [clock scan $date -gmt yes]" (around line number 143).

Add a line just before it, so that your code now reads:

      } else {
        set date [concat [lindex $date 0] [lindex $date 1]]
        set juliandate [clock scan $date -gmt yes]

That's it. Restart tkcvs and all should work now.