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def is_leap_year (year):
if year % 400 == 0:
return True
if year % 100 == 0:
return False
if year % 4 == 0:
return True
return False
def days_to_date(days, year):
if days > 365:
return "erroneous number of days\n"
days += 1
d = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
if is_leap_year(year) :
d[1] += 1
month = 0
while days > d[month]:
days -= d[month]
month += 1
month += 1
mn = ""
if month < 10:
mn += "0"
mn += str(month)
dy = ""
if days < 10:
dy += "0"
dy += str(days)
else:
dy += str(days)
return mn+"-"+dy+"-"+str(year)
def fridays(year):
day = [ "sat", "sun", "mon", "tue", "wed", "thu", "fri" ]
base_year = 2000
skip_days = year - base_year
for yr in range(base_year, year) :
if is_leap_year(yr):
skip_days += 1
first_fri_delta = 0
while "fri" != day[((skip_days + first_fri_delta)%7)] :
first_fri_delta += 1
n = first_fri_delta
last_fridays = []
tmp = "01-01-1900"
while n < 365:
date = days_to_date(n, year)
if tmp[0:2] != date[0:2]:
last_fridays.append(tmp)
n += 7
tmp = date
last_fridays.append(tmp)
for w in last_fridays :
print(w)
fridays(2024)
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