Python obtient le troisième vendredi du mois
import calendar
c = calendar.Calendar(firstweekday=calendar.SUNDAY)
year = 2015; month = 2
monthcal = c.monthdatescalendar(year,month)
third_friday = [day for week in monthcal for day in week if \
day.weekday() == calendar.FRIDAY and \
day.month == month][2]
Testy Turtle