The current month is November, which is month 11. It has 30 days. Today is day 9 of November.
to update.Documentation
editThis provides info about the current month in a sentence, like the month name, the month number, how many days it has, and what day it is of the month.
Place {{User:PorkchopGMX/sandbox/Currentmonthinfo}} on any page you want to have it there.