"BUT...I can only see the upcoming dates until the end of the month."
Actually, that's a limitation of the template. As stated in the install notes (in ssi_install.txt):
"These templates, as they are currently written, are limited to the "current month." So, if you have defined the template to display the next 5 days and it is 11/30/2001, you will actually only get 1 day displayed until 12/01/2001 where it will be fully refreshed."
Sorry to be the bearer of bad news...
Andy