def inc_month(month, year):
month += <NUM_LIT:1><EOL>if month > <NUM_LIT:12>:<EOL><INDENT>month = <NUM_LIT:1><EOL>year += <NUM_LIT:1><EOL><DEDENT>return month, year<EOL>
Increment the month and, if neccessary, the year.
Both month and year should be ints.