In the Day or Week picture, the time shaft begin with 0 clock and 0-6 hours take up space although it is useless because most people usually sleep this time.It leads to the real message below to blank blocks.So maybe u can allow to used-defined begin and end of time shaft.For example I like the one day begin with 5 and end with 22. This is not a diffcult question for your coder.But it is a real big improvement for mang user like me.