# File lib/ri_cal/fast_date_time.rb, line 193 def nth_wday_in_year(n, which_wday) if n > 0 first_of_year = change(:month => 1, :day => 1) first_in_year = first_of_year.advance(:days => (which_wday - first_of_year.wday + 7) % 7) first_in_year.advance(:days => (7*(n - 1))) else december25 = change(:month => 12, :day => 25) last_in_year = december25.advance(:days => (which_wday - december25.wday + 7) % 7) last_in_year.advance(:days => (7 * (n + 1))) end end