With latest git I can only press S-up or S-down on the time part of the timestamp once, after changing the time it moves point to the closing bracket, and doing another S-up or S-down changes the date part instead of time.
Example: with point on the "05" at the timestamp [2011-07-21 Thu 19:05] doing Shift-Up results in time correctly changed to 19:10, but point moves to the closing bracket. Next time you press S-Up it changes date, not time. Reverting following commit fixes the problem for me: commit fd0f8e10d1d3a339da9460d6c71283e85897c455 Author: Nicolas Goaziou <n.goaz...@gmail.com> Date: Thu Jul 21 11:48:35 2011 +0200 Fix bug with TODO states changes modifying scheduling of next headline * lisp/org.el (org-timestamp-change): some locales don't use the same length for date abbreviations. Set a marker at origin in case length of new timestamp is different.