It would appear so in less than a little unknown bug/eastereggs:
How to get the landscape view?
0 - Select Day or Listing
1 - Create an appointment,
2 - Click on Edit,
3 - Rotate the iPhone horizontally,
4 - Cancel the appointment and confirm
Every time I open calendar I have to perform this tedious process?
NO! (Almost)
Thanks to multitasking (specifically the possibility of reopening the apps just as we left) the horizontal orientation is preserved.
However, you must:
1) Remember to turn the device BEFORE you open the calendar.
2) If you opened another apps you must close the same apps with the device positioned horizontally and after you can open calendar.
For iDevice that do not support multitasking (2g and 3g iPhone, iPod touch 1, Jan. 2.) calendar will always appear at every opening in portrait orientation.
The same functionality and more can be found on the apps: Calendar Week (just 1,59 eur)
