#+BEGIN: clocktable :tstart "<-7d>" :tend "<now>"
#+END:
errors out on the tstart & tend times
According to all the documentation I can find, these are both valid 'special' time strings.
Attempts to evaluate the clocktable with C-c C-c give the error:
Updating dynamic block `clocktable' at line 57...
org-parse-time-string: Not a standard Org-mode time string: <-7d>
however this:
#+BEGIN: clocktable :tstart "<2013-05-08 Wed>" :tend "<2013-05-09 Thu>"
#+END:
works just fine