[Calendar][PATCH] CalendarScreenlet shows wrong number of days in month

[ASDFASDF]

I noticed today that Calendar screenlet shows that June has 31 days but in fact it has 30 days.
I think the error is in line 157 that goes:

for x in range(date[4] + 1):

and it should go:

for x in range(date[4]):

[ASDFASDF (user-487-deactivatedaccount)]

There was also error in the code that calculated the number of days in month.
Here is the patch.