specified try except with datetime.date()

Question

I am trying to catch the exceptions with incorrect month and days and negative years of date() from the datetime module but when I use ValueError exception I can't be specific. How can I specify my exceptions?

from datetime import datetime, date, timedelta



a = int(input('Year:'))
b = int(input('Month:'))
c = int(input('Day:'))

try:
    a_date = date(a, b, c)
    print(a_date.strftime("%d/%m/%Y"))
except ValueError:
    print('month must be in 1..12')