title: Change the hour when org-mode is starting new day
body: <p>I use org-mode to clock my work and sometimes I work past midnight for few hours.</p>
  
  <p>So, for example, I clocked time starting 03.06.2013 10pm and ending 04.06.2013 2am.</p>
  
  <p>And org-mode is dividing it at 0am, starting new day. But it would be more convinient for me if that time 0am-2am was recorded for 03.06.2013 instead of 04.06.2013.</p>
  
  <p>So I want to be able to specify at what time (say, 4am) org-mode is deciding the new day has started.</p>
  
  <p>I can use a workaround by shifting timezone for the emacs process, but then I need to keep in mind that all recorded time is shifted... Not very convinient.</p>